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Martin Hope
user.dz
Asked: 2020-05-02 21:05:30 +0800 CST
  • 2

I am using snapcraft & snap in a virtual-box. I gave it a 15GB image size but it ended up full quickly.

After verifying with a disk space analyzer, found that most of the space took by snaps packages. I removed some which I don't need like gnome-3-26 & gnome-3-28 core extensions.

But as you can see in the listing below, snap preserves previous release of each package as backup.

I am using this vbox just for testing. I want to make snap act like apt so it keeps only current release. I don't want to worry about cleaning it manually.

How to make snap auto-remove older package releases? 

# snap list --all
Name                  Version                Rev    Tracking         Publisher   Notes
core                  16-2.44.3              9066   latest/stable    canonical*  core
core                  16-2.44.1              8935   latest/stable    canonical*  core,disabled
core18                20200427               1754   latest/stable    canonical*  base
core18                20200311               1705   latest/stable    canonical*  base,disabled
gnome-3-34-1804       0+git.2c86692          27     latest/stable    canonical*  -
gnome-calculator      3.34.1+git4.c387feb0   704    latest/stable/…  canonical*  disabled
gnome-calculator      3.36.0+git4.51b0dc05   730    latest/stable/…  canonical*  -
gnome-characters      v3.32.1+git2.3367201   367    latest/stable/…  canonical*  disabled
gnome-characters      v3.32.1+git4.e06f0b2   495    latest/stable/…  canonical*  -
gnome-logs            3.34.0                 93     latest/stable/…  canonical*  -
gnome-logs            3.34.0                 81     latest/stable/…  canonical*  disabled
gnome-system-monitor  3.32.1-3-g0ea89b4922   111    latest/stable/…  canonical*  disabled
gnome-system-monitor  3.32.0-27-g32ed970e06  135    latest/stable/…  canonical*  -
gtk-common-themes     0.1-36-gc75f853        1506   latest/stable    canonical*  -
gtk-common-themes     0.1-30-gd41a42a        1502   latest/stable    canonical*  disabled
lxd                   4.0.1                  14804  latest/stable    canonical*  disabled
lxd                   4.0.1                  14890  latest/stable    canonical*  -
multipass             1.2.0                  2006   latest/stable    canonical*  classic
multipass             1.1.0                  1784   latest/stable    canonical*  disabled,classic
my-snap-name          0.1                    x13    -                -           disabled
my-snap-name          0.1                    x14    -                -           -
snapcraft             3.11                   4282   latest/stable    canonical*  classic
snappy-debug          0.36-snapd2.44+git     464    latest/stable    canonical*  -
snap
Martin Hope
user.dz
Asked: 2020-04-24 05:01:53 +0800 CST
  • 1

I used to look for local packages using Synaptic. Those packages which are locally installed but have no exact match in the current active repositories. As it is explained in this post: What does “local or obsolete” mean in Synaptic.

I finds that feature very helpful when it comes to debugging unmet dependencies issues. While I know how to get list of obsolete packages, I couldn't find a way for local packages.

So, is there any equivalent command line that lists all local packages?

Note to explain idioms I used.

  • orphan package: installed automatically as dependency, then dependent was removed.
  • obsolete package: installed but no package with same (name,architecture) in the repository.
  • local package: installed but no package with same (name,architecture,version) in the repository.

So I don't mean the all installed packages.

Test Case

  1. Synaptic → Menu:Settings → Repositories → Updates: Enable Unsupported Updates (backports) (Note: I use it as PPA example)
  2. Reload package lists
  3. Search for debhelper, select it. Menu:Packages → Force Version ...: Select and install the version from backports (Usually the highest version)
  4. Menu:Settings → Repositories → Updates: Disable Unsupported Updates (backports) (Note: I use it as PPA example)
  5. Reload package lists

Compare now between these two lists:

  1. Synaptic → SideBar:Status → Installed (local & obsolete)

    Synaptic - local & obsolete packages

  2. aptitude search '~o'

    user@user-vb:~$ aptitude search '~o'
i A linux-headers-4.15.0-19                          - Header files related to Linux kernel version 4.15.0        
i A linux-headers-4.15.0-19-generic                  - Linux kernel headers for version 4.15.0 on 64 bit x86 SMP  
i A linux-image-4.15.0-19-generic                    - Signed kernel image generic                                
i A linux-modules-4.15.0-19-generic                  - Linux kernel extra modules for version 4.15.0 on 64 bit x86
i A linux-modules-extra-4.15.0-19-generic            - Linux kernel extra modules for version 4.15.0 on 64 bit x86
user@user-vb:~$
package-management dpkg apt aptitude
Martin Hope
user.dz
Asked: 2017-04-19 03:43:11 +0800 CST
  • 3

I'm trying to snap package a non-pure python project. I used python plugin with custom build/install scripts.

This project contains 2 python packages that are required for desktop app:

  • alfanous (API)
  • alfanous-desktop (Qt PySide GUI)

snapcraft.yaml file:

name: alfanous
version: "0.7.8"
summary: Alfanous
description: GNU hello prints a friendly greeting.
  This is part of the snapcraft tour at http://snapcraft.io/create/
#confinement: strict
confinement: devmode

apps:
  alfanous-gui:
    command: usr/bin/alfanous-desktop
    #desktop: usr/share/applications/my-app.desktop
  alfanous-cli:
    command: usr/bin/alfanous-console

parts:
  alfanous-git:
    build-packages:
      #- python
      - sqlite3
      - pyside-tools
      - qt4-linguist-tools
      - python-babel
      - qt4-qmake
      - python-setuptools
      #- python-pyparsing
      #- perl
    #plugin: make
    plugin: python
    python-version: python2
    #source: https://github.com/Alfanous-team/alfanous/archive/0.7.8.tar.gz
    source: https://github.com/Alfanous-team/alfanous.git
    source-type: git
    source-depth: 1
    #source-tag: 0.7.8
    build: |
      make build
    install: |
      echo _______#######:$(pwd)
      #make install_api 
      make install_api DESTDIR=$SNAPCRAFT_PART_INSTALL
      make install_desktop DESTDIR=$SNAPCRAFT_PART_INSTALL
    stage-packages:
      - python-pyparsing
      - python-pyside
      #- epydoc
      #- sphinx
      - python-babel
      - python-setuptools
    python-packages:
      - pyparsing
      - pyside
      - babel

The snap package is built and installed without errors. However, if i try to run it:

$ alfanous.alfanous-cli
Traceback (most recent call last):
  File "/snap/alfanous/x3/usr/bin/alfanous-console", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/snap/alfanous/x3/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2927, in <module>
    @_call_aside
  File "/snap/alfanous/x3/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2913, in _call_aside
    f(*args, **kwargs)
  File "/snap/alfanous/x3/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2940, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/snap/alfanous/x3/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 635, in _build_master
    ws.require(__requires__)
  File "/snap/alfanous/x3/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 943, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/snap/alfanous/x3/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 829, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'alfanous==0.7.29' distribution was not found and is required by the application

My first suspect is non-complete PYTHONPATH, trying to debug:

snap run --shell alfanous.alfanous-cli
env | grep -i python

brings nothing.

and both packages are there:

$ ls /snap/alfanous/current/usr/lib/python2.7/site-packages/
alfanous                        alfanousDesktop
alfanous-0.7.29-py2.7.egg-info  alfanousDesktop-0.7.29-py2.7.egg-info

How could I setup PYTHONPATH correctly? Shouldn't the python plugin take care of that?

snapcraft v2.28 Ubuntu 16.04.2 LTS 64Bit

python
Martin Hope
user.dz
Asked: 2017-04-18 05:06:52 +0800 CST
  • 5

I used to build Debian packages (quilt), it supports applying patches while build process. Patches are stored in debian/patches folder and they are usually used to add fixes not committed yet to the upstream source or add specific platform tunning.

My case is a package that needs custom build command:

make build; make install_api; make install_desktop

instead of standard way:

make; make install

Current proposed solution is to:

  • modify Makefile and add default: & install: entries.

The error got when running snapcraft --no-parallel-build without modifying source:

make install DESTDIR=/home/username/Desktop/sandbox/alfanous-snap/parts/alfanous-git/install
make: *** No rule to make target 'install'.  Stop.
Command '['/bin/sh', '/tmp/tmp_f_u1ktl', 'make', 'install', 
 'DESTDIR=/home/username/Desktop/sandbox/alfanous-snap/parts/alfanous-git/install']'
 returned non-zero exit status 2

So, is there any way to add a patch to snapcraft build? I'm open to any other solution/workaround.

packaging
Martin Hope
user.dz
Asked: 2016-12-13 02:56:28 +0800 CST
  • 0

I have faced lately some cases where the asker had a APT removal operation stuck due some kernel script errors.

Sometimes is easy to fix the root cause.

But in some other rare cases, it is hard or long path to go with debugging. Specially with non boot-able system or only recovery shell available.

I will add some cases here:

I have already used a dirty solution as explained my answer below. I would ask for a cleaner workaround to manually remove a kernel package as DPKG do?

apt
Martin Hope
user.dz
Asked: 2016-07-10 10:01:11 +0800 CST
  • 7

I have a laptop with Ubuntu 14.04 installed in BIOS (Legacy mode).

sudo dmidecode

BIOS Information
    Vendor: Dell Inc.
    Version: A16
    Release Date: 12/05/2013
...
System Information
    Manufacturer: Dell Inc.
    Product Name: Latitude E6410

Instead of upgrading, I tried to install new Xubuntu 16.04 in UEFI mode.

  • Switched BIOS boot from Legacy to UEFI and disabled the RAID for SATA.

    (SoftRAID/FakeRAID corrupt the GPT table backup in the end of disk, on each boot)

  • Booted using USB key in UEFI mode & resized and converted partition table from MBR to GPT.

  • Booted again using USB key in UEFI mode and installed Xubuntu. Created a new boot EFI (FAT32) partition.

On reboot, There is a Ubuntu entry in UEFI menu but selecting it raise a BIOS error message about no boot media.

Tried multiple things but no success:

  • Boot-repair.
  • Change EFI partition to FAT16.
  • Reinstalled Xubuntu.

partition in gparted

sudo sfdisk -d /dev/sda

label: gpt
label-id: 4A4481B5-0322-411E-8D05-552FBE6189AC
device: /dev/sda
unit: sectors
first-lba: 34
last-lba: 976773134

/dev/sda1 : start=     4194304, size=   127924224, type=0FC63DAF-8483-4772-8E79-3D69D8477DE4, uuid=F1D50A87-ACB2-4868-B1EA-66C3D5223EA4, name="Linux filesystem"
/dev/sda2 : start=   874115072, size=    98463744, type=0FC63DAF-8483-4772-8E79-3D69D8477DE4, uuid=C96E6320-18EA-40B2-BA46-79FC66407917, name="Linux filesystem"
/dev/sda4 : start=        2048, size=      409600, type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B, uuid=BCB6E471-44F7-4C42-81EC-B276F1D6B6E6, name="EFI"
/dev/sda5 : start=   154339328, size=   715456512, type=0FC63DAF-8483-4772-8E79-3D69D8477DE4, uuid=AEBBA3F2-F8B6-40C0-ABFE-9F530FC5F641, name="Linux filesystem"
/dev/sda6 : start=   136513536, size=    17825792, type=0657FD6D-A4AB-43C4-84E5-0933C84B4F4F, uuid=515C9B77-B282-4007-8F1A-B0C5D908591E, name="Linux swap"
boot
Martin Hope
user.dz
Asked: 2016-06-15 03:21:52 +0800 CST
  • 82

Background:

C Original Code: (working fine)

  • I already get one working in C language, see my other question:

    How to develop a System Indicator for Unity?

    However, indicator-sysmonitor is already developed in Python as many other application indicators. I don't like the idea that developers obliged to port their projects to C or write a Python-C proxy if they want to show the indicator in greeter/lock/ubiquity screens. Instead, making indicator-sysmonitor creates a system indicator directly from python would be the best solution (no workarounds, and it will be a generic solution for all python projects that currently using appindicator).

Python Code: (My failed trial to port c code to python)

  • I'm struggling to port it into Python. Here is my current code which doesn't work. It does create DBus object for both Menu & Actions. It is listed in the XFCE indicators plugin. But not showed on the panel.

    /usr/lib/indicator-test/indicator-test-service

    #!/usr/bin/python2

import os
import sys

import gi
from gi.repository import Gio, GLib

APPLICATION_ID = 'local.sneetsher.indicator.test'
DBUS_MENU_PATH = '/local/sneetsher/indicator/test/desktop'
DBUS_ACTION_PATH = '/local/sneetsher/indicator/test'

def callback():
    print ok

def quit_callback(notification, loop):
    global connection
    global exported_action_group_id
    global exported_menu_model_id

    connection.unexport_action_group (exported_action_group_id)
    connection.unexport_menu_model (exported_menu_model_id)

    loop.quit()

def cancel (notification, action, data):
    if action == "cancel":
        print "Cancel"
    else:
        print "That should not have happened (cancel)!"

def bus_acquired(bus, name):
    # menu
    submenu = Gio.Menu()
    submenu.append("Show", "show")
    item = Gio.MenuItem.new(None, "_header")
    item.set_attribute([("x-canonical-type","s","com.canonical.indicator.root")])
    item.set_submenu(submenu)
    menu = Gio.Menu()
    menu.append_item (item)

    actions = Gio.SimpleActionGroup.new()
    action1 = Gio.SimpleAction.new("_header", None)
    actions.insert(action1)
    action2 = Gio.SimpleAction.new('show', None)
    actions.insert(action2)
    action2.connect("activate",callback)

    global connection
    connection = bus

    global exported_action_group_id
    exported_action_group_id = connection.export_action_group(DBUS_ACTION_PATH, actions)

    global exported_menu_model_id
    exported_menu_model_id = connection.export_menu_model(DBUS_MENU_PATH, menu)

def setup ():
    #bus connection
    Gio.bus_own_name(Gio.BusType.SESSION, APPLICATION_ID, 0, bus_acquired, None, None)

if __name__ == '__main__':

    connection = None
    exported_menu_model_id = 0
    exported_action_group_id = 0
    password = ""

    loop = GLib.MainLoop()
    setup ()

    loop.run()

    local.sneetsher.indicator.test

    [Indicator Service]
Name=indicator-test
ObjectPath=/local/sneetsher/indicator/test

[desktop]
ObjectPath=/local/sneetsher/indicator/test/desktop

[desktop_greeter]
ObjectPath=/local/sneetsher/indicator/test/desktop

[desktop_lockscreen]
ObjectPath=/local/sneetsher/indicator/test/desktop

    local.sneetsher.indicator.test.service

    [D-BUS Service]
Name=local.sneetsher.indicator.test
Exec=/usr/lib/indicator-test/indicator-test-service

    90_unity-greeter.gschema.override

    [com.canonical.unity-greeter]
indicators=['ug-accessibility', 'com.canonical.indicator.keyboard', 'com.canonical.indicator.session', 'com.canonical.indicator.datetime', 'com.canonical.indicator.power', 'com.canonical.indicator.sound', 'local.sneetsher.indicator.test', 'application']

Question:

I expect the reason why, I didn't create the menu structure or its meta (pseudo items like _header) as they are in the original C code.

Could anyone make a working port of this system indicator code in C to Python?

unity
Martin Hope
user.dz
Asked: 2015-12-09 05:06:32 +0800 CST
  • 14

Note about possible duplicate:

AFAIK, This is not a duplicate of How do I resolve unmet dependencies after adding a PPA? otherwise please prove it by solving the test problem I mention below using any answer from there.

Background:

I faced this problem before How to fix installation wine on Ubuntu 14.04.3LTS 64 bit. It was solved by manual/human review of all recursive dependencies of the target package (wine).

Reproduce the problem (Test Case):

Let's create same situation quiet simplified with just 1 trouble package.

  1. Install fresh Ubuntu 14.04 on VirtualBox.
  2. Open software-properties-gtk and enable backports repository.

  3. Get last packages list

    sudo apt-get update

  4. Run apt-get -s install wine to confirm that wine can be installed.

  5. Install the troubling package libcgmanager0 from backports

    $ apt-cache policy libcgmanager0
libcgmanager0:
  Installed: 0.24-0ubuntu5
  Candidate: 0.24-0ubuntu7.5
  Version table:
     0.39-2ubuntu2~ubuntu14.04.1 0
        100 http://dz.archive.ubuntu.com/ubuntu/ trusty-backports/main amd64 Packages
     0.24-0ubuntu7.5 0
        500 http://dz.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
     0.24-0ubuntu7.1 0
        500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
 *** 0.24-0ubuntu5 0
        500 http://dz.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

    Force apt to install libcgmanager0 version 0.39-2ubuntu2~ubuntu14.04.1

    sudo apt-get install libcgmanager0=0.39-2ubuntu2~ubuntu14.04.1

Now we end up in same situation of the user from the mentioned question in the background, wine installation fails with unmet dependency, showing only the first level dependency packages.

  • apt-get -s install wine

    Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 wine : Depends: wine1.6 but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

  • apt-get -s install wine1.6

    Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 wine1.6 : Depends: wine1.6-i386 (= 1:1.6.2-0ubuntu4)
E: Unable to correct problems, you have held broken packages.

  • apt-get -s install wine1.6-i386

    Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 wine1.6-i386:i386 : Depends: libglu1-mesa:i386 but it is not going to be installed or
                              libglu1:i386
                     Depends: libgphoto2-6:i386 (>= 2.5.2) but it is not going to be installed
                     Depends: libgphoto2-port10:i386 (>= 2.5.2) but it is not going to be installed
                     Recommends: libsane:i386 but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

It is not practical to follow dependencies with apt-get install one by one.

Ideal Solution:

The real issue here

  1. apt couldn't install libcgmanager0:i386 version 0.39-2ubuntu2~ubuntu14.04.1 because backports repository have a lower priority 100 less then version 0.24-0ubuntu7.5 from updates repository with 500
  2. apt couldn't install libcgmanager0:i386 version 0.24-0ubuntu7.5 because libcgmanager0:amd64 is installed with a different version 0.39-2ubuntu2~ubuntu14.04.1

The quickest fix is, to force installing same i386 version from backports 

sudo apt-get install libcgmanager0:i386=0.39-2ubuntu2~ubuntu14.04.1

or downgrade it (amd64) to any version from regular repositories

sudo apt-get install libcgmanager0=0.24-0ubuntu7.5

Ways/tools I have tried:

  • Disabling PPA's has no relation to the problem.
  • Using aptitudein interactive mode, brings only solutions with many removes (>200 !!!).
  • Use apt-get install manually following the dependency tree. Unpractical, as the first & second level dependencies didn't raise meaningful message about the conflict.
  • debfoster can generate the recursive dependencies but only for already installed package. However wine is not yet installed.

Topic / My interests:

Let's say I want to install wine without knowing about the problem of libcgmanager0 package (or exactly libcgmanager0:amd64=0.39-2ubuntu2~ubuntu14.04.1 that already installed).

I'm looking for a debug method or a way to know the name of the troubling package and to understand quickly what was going on.

  1. How to debug unmet dependencies problems in general?

    May be there some new options in dpkg/apt/aptitude that trace the internal dependency resolver. That can show libcgmanager0 in its output.

  2. If there is no canonical answer to this, Could anyone show me a better way to generate the recursive dependencies list or simulate the dependency resolver with more details which can help fix the problem?

    Why all dependencies? Because I want to check the output of the below commands for all packages at once.

    • apt-cache policy <all-dependencies>
    • apt-get -s install <all-dependencies>
apt
Martin Hope
user.dz
Asked: 2015-11-14 01:54:16 +0800 CST
  • 2

I had installed Kubuntu 15.04 sometime ago. I upgraded to 15.10, things were going fine till I added ubuntu-desktop to use Unity DE.

When booting with systemd, on startup or login, I get black or white screen for all Virtual Terminamls (TV's / TTY's) including TV7 graphical one. In some rare cases flickering screen between lightdm & sddm GUI, and that's how I got to know that both were running and may be the cause of this problem (black screen).

It works fine: when booting with upstart or switching DM back to sddm.

  • Flickering screen between KDE/sddm Unity/lightdm

    https://youtu.be/xI1fpTyklNo
    https://youtu.be/HpH309GqFcU

  • ps ax | grep dm

     1377 ?        SLsl   0:00 /usr/sbin/lightdm
 1459 tty7     Ssl+   1:10 /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
 1526 ?        Ssl    0:00 /usr/bin/sddm
 1626 ?        SLl    0:00 lightdm --session-child 12 19
 3843 pts/2    S+     0:00 grep --color=auto dm

  • systemctl status default.target

    ● graphical.target - Graphical Interface
   Loaded: loaded (/lib/systemd/system/graphical.target; static; vendor preset: enabled)
   Active: active since Fri 2015-11-13 09:46:21 CET; 50min ago
     Docs: man:systemd.special(7)

Nov 13 09:46:21 BlueSkies systemd[1]: Reached target Graphical Interface.

  • sudo dpkg-reconfigure lightdm

    Default display manager:
    gdm
  * lightdm
    sddm
    xdm

  • ls -l /etc/systemd/system/display-manager.service

    lrwxrwxrwx 1 root root 35 Nov 13 17:26 /etc/systemd/system/display-manager.service -> /lib/systemd/system/lightdm.service

I don't want to remove any DM, also I do want to keep LightDM as default. So, is there a canonical answer to How to set the default DM for this mixed release 15.10 (systemd/upstart)?

I could find many similar question without the answer I'm looking for:

upgrade
Martin Hope
user.dz
Asked: 2015-10-28 12:02:09 +0800 CST
  • 39

This is not a duplicate of How to create Unity indicators?. I'm looking for system indicator not application indicator.

Backgound:

From these two questions:

I learned that there are two types of indicators:

All application indicators are handled/showed by indicator-application (a system one). System indicators are showed directly by Unity panel.

Both questions are about adding/removing indicators from login & lock screen. The first was a straight forward setup (when dealing with system indicators). The second was a tough setup (when dealing with app indicators), which needs modifying the source of panel service (unity package) for lock screen and the source of unity-greeter for login screen.

As the case of sysmonitor, to me that was workaround. The best solution is to implement a system indicator instead of an application one.

Topic:

  • Is there a unified API for system indicators (Preferably: Python then C/C++)? Please, reference to the official documentations.

  • Most system indicators are written using Vala programming language. Could any one write small demo for a system indicator using Python or C?

Update:

I found few links that may give a push:

  • In Application Indicators project page, They listed links to AppIndicator-0.3 API (C & Python) used for application indicators.

    They listed also Indicate-0.7 API (C & Python). What is this? Well, it is a DBus messaging channel between Desktop Applications.

  • On other hand, in System Indicators project page, they mentioned:

    System Indicator APIs

    • Messaging Menu using libindicate.
    • Sound Menu using libunity.
    • Date/Time Indicator using Evolution-Data-Server

    They seem listing Data API not Indicator Development API like for Evolution-Data-Server. But not sure about libindicate & libunity. Did any one work with these two libraries?

    Try apt-cache rdepends libunity9 libindicator7 libindicator3-7 to see which indicator is relaying these libraries.

Update2: This to keep interested users updated.

From what I have collected till now, here is the order of possible solutions:

  1. libindicator3-7 (high, Many indicators depend on it)

    I found some test examples in the source, some dummy indicators that I have tried, could be installed in /usr/lib/indicators3/7/, they are shared lib .so. I could get them displayed in Login & Regular Session but Not in Lock Screen.

    However there are some test indicator services, which seems like Unity system ones. I haven't tried them yet.

  2. libindicator7

    From same source as libindicator3-7, from rdepends:

    mate-indicator-applet
lxpanel-indicator-applet-plugin

    It seems to be used to make container for indicators in panels.

  3. libunity9 (low)

    No research yet

unity
Martin Hope
user.dz
Asked: 2015-10-20 05:40:44 +0800 CST
  • 2

I've tried installing droidcam to solve another question following instruction here: Install DroidCam (Wireless Android Webcam) Client In Ubuntu Via PPA

The installation fails with post-script error, full log found here.

Now, I want to clean it up and remove it completely. So, I run sudo apt-get purge droidcam. But I was surprised that I have to run it 3 times to fully clean its installation.

$ sudo apt-get purge droidcam        
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  linux-headers-3.19.0-15 linux-headers-3.19.0-15-generic linux-image-3.19.0-15-generic linux-image-extra-3.19.0-15-generic
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
  droidcam*
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 1,529 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 239094 files and directories currently installed.)
Removing droidcam (1.3-0ubuntu0) ...
rmmod: ERROR: Module v4l2loopback_dc is not currently loaded
dpkg: error processing package droidcam (--purge):
 subprocess installed post-removal script returned error exit status 1
Processing triggers for gnome-menus (3.10.1-0ubuntu5) ...
Processing triggers for bamfdaemon (0.5.1+15.04.20150202-0ubuntu1) ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for desktop-file-utils (0.22-1ubuntu3) ...
Processing triggers for mime-support (3.58ubuntu1) ...
Processing triggers for hicolor-icon-theme (0.14-0ubuntu1) ...
Errors were encountered while processing:
 droidcam
E: Sub-process /usr/bin/dpkg returned an error code (1)

$ sudo apt-get purge droidcam 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  linux-headers-3.19.0-15 linux-headers-3.19.0-15-generic linux-image-3.19.0-15-generic linux-image-extra-3.19.0-15-generic
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
  droidcam
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 1,529 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 239088 files and directories currently installed.)
Removing droidcam (1.3-0ubuntu0) ...

$ sudo apt-get purge droidcam 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  linux-headers-3.19.0-15 linux-headers-3.19.0-15-generic linux-image-3.19.0-15-generic linux-image-extra-3.19.0-15-generic
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
  droidcam*
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
(Reading database ... 239087 files and directories currently installed.)
Removing droidcam (1.3-0ubuntu0) ...
Purging configuration files for droidcam (1.3-0ubuntu0) ...
dpkg: warning: while removing droidcam, directory '/opt' not empty so not removed

$ sudo apt-get purge droidcam 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package 'droidcam' is not installed, so not removed
The following packages were automatically installed and are no longer required:
  linux-headers-3.19.0-15 linux-headers-3.19.0-15-generic linux-image-3.19.0-15-generic linux-image-extra-3.19.0-15-generic
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

What I want to know:

  • Why, I need to run it multiple times?
  • How does apt-get purge work? I though apt-get purge will remove all installed files with one pass.

My first expectation, may be droidcam is not well packaged.

apt