eri0o's questions

I want to build SDL2 from source so I can use a newer version, that prefers dlopen instead of linking to libraries like the package that comes from ubuntu package manager, but also because I want to build it in an older version of Ubuntu so it has better glibc compatibility.

Problem is I also want to produce one artifact that is a debian package of my project, but I need to also have SDL2 built as a debian package that is installed on system to produce the correct rules when packaging my project.

I unpacked the source from SDL2 (2.0.12), used ./configure and make to build the sources. I then used dpkg-buildpackage -us -uc to build the debian package for SDL2. The problem is the resulting package fails to install complaining of an unmet dependency of libudev, which IS already installed in my system. Is there something I am missing when building a debian package from sdl2 souces?

I want to install glslc , which is one of the tools of shaderc, so I can compile GLSL into Vulkan's SPIR-V shader format.

Is there a package that already provides it or I should build it from source?

Apparently it's not packed on debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=890472

I noted it appears to be included in the LunarG Vulkan SDK: https://vulkan.lunarg.com/doc/sdk/1.2.141.2/linux/getting_started.html

From own LunarG website, it's not yet packed for 20.04, only 16.04 and 18.04. This situation may change soon.

I need both 32 bit and 64 bit for libncurses.so.5 on Ubuntu 20.04 (Focal Fossa) for building an Android application on an older Android NDK. What are my options? libncurses.so.5 is not on apt-get anymore.

Using Ubuntu 20.04 Focal Fossa, install virtualbox:

sudo apt install virtualbox virtualbox-ext-pack

Now load a Windows 10 VM:

https://developer.microsoft.com/en-us/windows/downloads/virtual-machines/

Click the Download Virtualbox VM

Now, create a shared folder between this VM and the Ubuntu host. Place a bunch of files on this folder.

Now, on Windows 10, try to access this folder. The VM will reboot.

This doesn't happen in Ubuntu 18.04

How do I fix this?

I need to see what is exactly packed inside of a .snap file, like we can inspect .apk files, for debugging purposes. Is there any way to extract it to files and folders or any .snap inspector similar to the .apk one on Android Studio?

When I use lxd, it fails on lxd init .

$ snap install lxd
lxd 3.0.0 from 'canonical' installed
$ lxd init
Error: Failed to connect to local LXD: Get http://unix.socket/1.0: dial unix 
/var/snap/lxd/common/lxd/unix.socket: connect: no such file or directory

I have the following on my computer:

$ snapcraft --version
snapcraft, version 2.42.1
$ uname -a
4.13.0-43-generic #48~16.04.1-Ubuntu SMP Thu May 17 12:56:46 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

I don't know if this is relevant, but my computer uses Intel i7-7500U and has Secure Boot UEFI.

Below is output of more commands:

$ snap services lxd
Service     Startup  Current
lxd.daemon  enabled  active
$ snap logs lxd.daemon
2018-05-28T22:22:42Z lxd.daemon[1404]:   5: fd:  11: pids
2018-05-28T22:22:42Z lxd.daemon[1404]:   6: fd:  12: perf_event
2018-05-28T22:22:42Z lxd.daemon[1404]:   7: fd:  13: hugetlb
2018-05-28T22:22:42Z lxd.daemon[1404]:   8: fd:  14: cpu,cpuacct
2018-05-28T22:22:42Z lxd.daemon[1404]:   9: fd:  15: freezer
2018-05-28T22:22:42Z lxd.daemon[1404]:  10: fd:  16: net_cls,net_prio
2018-05-28T22:22:42Z lxd.daemon[1404]:  11: fd:  17: name=systemd
2018-05-28T22:22:42Z lxd.daemon[1404]: lvl=warn msg="CGroup memory swap accounting is disabled, swap limits will be ignored." t=2018-05-28T22:22:42+0000
2018-05-28T22:22:42Z lxd.daemon[1404]: lvl=warn msg="Failed to update instance types: Get https://images.linuxcontainers.org/meta/instance-types/.yaml: lookup images.linuxcontainers.org on [::1]:53: dial udp [::1]:53: connect: cannot assign requested address" t=2018-05-28T22:22:42+0000
2018-05-28T22:22:43Z lxd.daemon[1404]: => LXD is ready
$ lxd init
Error: Failed to connect to local LXD: Get http://unix.socket/1.0: dial unix /var/snap/lxd/common/lxd/unix.socket: connect: permission denied

Does lxd snap requires ipv6? Can I force ipv4? Is something else wrong?

Edit:

$ groups myusername 
 myusername : myusername adm cdrom sudo dip plugdev lpadmin sambashare lxd 

I am a member of lxd group. but

$ groups 
 myusername adm cdrom sudo dip plugdev lpadmin sambashare 

has no lxd. What does it mean?

Lots of times I need to Ctrl+C (or Ctrl+Insert) multiple times to copy something. I would appreciate visual feedback that says "a new thing has been copied" or something like that. Is there someway to add this to Ubuntu?

How do I install Adventure Game Studio AGS Editor in Ubuntu 16.04 (Xenial Xerus) ? I am pretty sure it can be built for Linux too, I just am not very experienced in building things from source.

When I do sudo apt update I keep getting stuck in the line below:

0% [Connecting to security.ubuntu.com (2001:67c:1360:8001::21)] 

Is there any problem with ipv6 resolution in Ubuntu? Is there a way to force ipv4 in case this is the problem ? (maybe my router is not so smart, I don't know).

Ping output:

ping6 2001:67c:1360:8001::21
PING 2001:67c:1360:8001::21(2001:67c:1360:8001::21) 56 data bytes
^C
--- 2001:67c:1360:8001::21 ping statistics ---
12 packets transmitted, 0 received, 100% packet loss, time 11000ms

Traceroute output:

 traceroute6  2001:67c:1360:8001::21traceroute to 2001:67c:1360:8001::21
 , 30 hops max, 24 byte packets
 1  * * *
 2  * * *
 3  * * *
 4  * * *
 5  * * *
 6  * * *
 7  * * *

I am trying to make an application. Currently I am using the following directories during installation:

/usr/share/applications is where I drop software.desktop

/usr/share/icons is where I drop icon.svg

/usr/share/mime/packages is where I drop my mime.xml file.

Since those are the only times during install that require root access, I was wondering if the were equivalent, non root directories, where I could throw these files and they would get pickeup by the system (Unity launcher for instance).

Thanks

If I have certain applications open and each window positioned and sized in a certain way, can I save then? Also can I lock then to these positions?

Ideally I would make icon shortcuts for those views so once I turn on my computer I can select between a workspace for Web Development, Drawing + listening to music, Writing.

I built a snap using python3 plugin. It should open a PyQt5 app. The snap built with no problem, but after the snap is installed, calling the installed python script in command line fails with the error below.

My snapcraft.yaml

name: pyqthelloworld
version: 0.1.0
summary: pyqt hello world
description: |
 a pyqt5 python3 hello world test

confinement: strict

apps:
  pyqthelloworld:
    command: pyqthelloworld

parts:
  pyqthelloworld:
    plugin: python3
    source: git://github.com/ericoporto/pyqthelloworld
    source-type: git
    stage-packages:
      - python3-pyqt5
      - libc-bin
      - locales

I built and installed using the commands below

snapcraft stage
snapcraft snap
sudo snap install pyqthelloworld_0.1.0_amd64.snap

In command line

$ pyqthelloworld

Fatal Python error: Py_Initialize: Unable to get the locale encoding
ImportError: No module named 'encodings'

Current thread 0x00007fb8fc0ff700 (most recent call first):
Aborted (core dumped)

What's wrong? And how do I debug similar errors in snaps?

I am using Ubuntu 16.04 LTS 64-bit

Edit: checking if encodings is there (is this correct?)

user@pc:~/git/pyqthelloworld/snap$ find . -iname encodings
./prime/usr/lib/python3.5/encodings
./parts/pyqthelloworld/install/usr/lib/python3.5/encodings
./stage/usr/lib/python3.5/encodings

Edit2: I am now getting (snapcraft 2.15.1):

$ pyqthelloworld 
This application failed to start because it could not find or load the Qt platform plugin "xcb".

Reinstalling the application may fix this problem.
Aborted (core dumped)

Just to clarify, no changes, just a newer snapcraft on the same (and updated) Ubuntu 16.04 computer.

Edit3:

Now I added a snap folder, where I am keeping the snapcraft.yaml (which is now a little different than the one in the beginning of this question!) and a little wrapper to deal with the locale error - which I don't think should be needed.

Now when I run the command (pyqthelloworld) for the installed snap I am getting:

This application failed to start because it could not find or load the Qt platform plugin "xcb"
in "".

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, xcb.

Reinstalling the application may fix this problem.
Aborted (core dumped)

I have a clean Ubuntu 16.04 install, and opening Libre Office, it said it requires a JRE installed before I can run or write macros. I want to write VBA macros.

Running apt search jre shows many versions. Which should be installed?

I use the Ubuntu Desktop on my PC and want my Ubuntu Server to automount USB media just like it does on my Desktop: plugin, a folder with same name as label appears in /media/ with the device mounted.

How can I do this?