Håkon Hægland's questions

I would like to occasionally type some hangul letters by pressing SUPER+SPACE and select "Korean" input. But I am not able to make it work yet on Ubuntu 22.04. When I press SUPER+SPACE I can choose between korean and norwegian:

if I choose "ko" (korean) and start typing in e.g. gedit I only get american characters. How can I get the hangul letters?

The "Keyboard" settings page shows the following:

The "Region & Language" settings show:

Edit:

I discovered another settings dialog only available through the shell command "ibus-setup":

Here, I added "Korean-Hangul" from the "Input Method" tab:

Clicking the "Preferences" button in the dialog gives me a new "IBusHangul Setup" dialog:

Here, I added a new toggle key "CTRL+SPACE" and also checked the box "Start in Hangul mode". After applying these changes and logging out and in again, still it does not work.

I am following this example of how to run an X11 app in a docker container. I am on Ubuntu 20.04 and using X11:

$ echo $XDG_SESSION_TYPE
x11

My Dockerfile:

FROM ubuntu:20.04
RUN apt-get update && apt-get install -y x11-apps
ARG user=hakon
ARG home=/home/$user
RUN groupadd -g 1000 $user
RUN useradd -d $home -s /bin/bash -m $user -u 1000 -g 1000 \
        && echo $user:ubuntu | chpasswd \
        && adduser $user sudo
WORKDIR $home
USER $user
ENV HOME $home
COPY entrypoint.sh .
ENTRYPOINT ["./entrypoint.sh"] 

where entrypoint.sh is:

echo "DISPLAY=$DISPLAY"
xclock  # <-- This is the X11 application I am testing with. It shows a clock in a Window
echo "Done."
exec bash

I build the image using:

$ docker build -t gui-test-ubuntu-2004 .

Then run the container with:

$ docker run -v /tmp/.X11-unix:/tmp/.X11-unix -e DISPLAY=$DISPLAY \
       -h $HOSTNAME -v $HOME/.Xauthority:/home/hakon/.Xauthority gui-test-ubuntu-2004

The output is:

DISPLAY=:0
Error: Can't open display: :0
Done.

and the xclock gui window is not showing. What am I missing here?

I am trying to compile this example https://learnopengl.com/Getting-started/Hello-Window:

#include <glad/glad.h>
#include <GLFW/glfw3.h>
// ...

I have installed libglfw3-dev but I am still missing the glad.h header file. A search on packages.ubuntu.com gave no results. There is a github page for glad but it does not provide glad.h as far as I can see.

After installing Ubuntu 19.04, ALT+TAB no longer groups windows under the same application. Instead it cycles through all windows irrespective of which app it belongs to. In Ubuntu 18.10 it worked differently (and better in my opinion) such that ALT+TAB switched between apps, and ALT+| (key above TAB) switched between windows of the same app. How can I achieve this setup in 19.04?

NOTE: ALT+| still cycles through windows of the same app, but I cannot use ALT+TAB first to select the app from the shorter list of apps (compared to the list of windows), so then ALT+TAB loses much of its power if you have many windows open.

After running Ubuntu 18.04 for some days without logging out, things has started to get slower and slower. When I try to switch windows, it can take 5-10 seconds before anything happens. The same when trying to activate a window or text field for giving keyboard input. I opened a terminal window and ran top and watched the output for some minutes. In general, three processes stays on the top of the list: 1) gnome-shell (8% cpu), 2) chrome (6% cpu), and 3) Xorg (4% cpu):

These number does not change very much (± 1% ) while I am watching.

I did not have this problem in 17.04, however it appeared in 17.10, but only for the first few weeks I think. Then suddenly everything worked as normal. But now after upgrading to 18.04, the problem has returned.

See also Ubuntu 17.10 tons of lags with mouse and window glitch

In Ubuntu 17.10 (under an Xorg session) I could get the window ID from the WINDOWID environment variable from gnome-terminal by typing:

$ echo $WINDOWID

in the terminal window. In Ubuntu 18.04, this does not work. However, it seems to work fine with other terminal emulators I have tried, like xterm and konsole. So the issue seems to be specific to gnome-terminal.

How can I get the window id of the current gnome-terminal window?

After upgrading from Ubuntu 17.04 to 17.10, I get a warning about that option -e is deprecated when starting gnome-terminal from the command line. For example, assume I want to open a gnome-terminal with two tabs, and running separate commands in each tab:

$ gnome-terminal --tab --active -e 'bash -c "echo Hello; exec bash"' --tab -e 'bash -c "echo Hello2; exec bash"'
Option “-e” is deprecated and might be removed in a later version of gnome-terminal.
Use “-- ” to terminate the options and put the command line to execute after it.
Option “-e” is deprecated and might be removed in a later version of gnome-terminal.
Use “-- ” to terminate the options and put the command line to execute after it.

But how can I run separate commands for each tab if I am supposed to use -- to terminate the options? For example, the following does not work:

$ gnome-terminal --tab --active -- bash -c "echo Hello; exec bash" --tab -- bash -c "echo Hello2; exec bash"

It just opens a single tab.

In Ubuntu 17.04 I could use wmctrl to switch to a gnome-terminal window with given window ID:

wmctrl -ia $gnome_term_winid

The window ID of a given gnome-terminal could also be displayed from the terminal by typing:

echo $WINDOWID

After upgrading to Ubuntu 17.10, this is no longer the case. First, echo $WINDOWID gives nothing, and also wmctrl -lx does not show any gnome-terminal windows.

After running software updater, the path bar in the file dialog (for example the one you get when choosing Open File in in Google Chrome or Firefox) is missing. This is frustrating since it's no longer possible to copy a path from the terminal (for example) and paste it into the file dialog. Here is a screenshot of the dialog:

How can I get back the path bar?

I am trying to figure out where okular is saving annotations for pdf files. According to this answer they should be in ~/.kde/share/apps/okular/docdata but there is no files in that folder. But still when I open the pdf file, the annotations are there. If I copy the pdf file to another file and open the other file, the annotations are gone, so they cannot be saved in the file itself either. Any suggestions?

I am trying to add a launcher icon for a custom Python script showing a Tkinter window (script location: /home/hakon/my-tkapp.py):

#! /usr/bin/env python3
import tkinter as tk
root = tk.Tk(className='MyTkApp')
label = tk.Label(root, text="Hello World")
label.pack()
root.mainloop()

The script is executable. I am using pyenv, so if I run the following from gnome-terminal:

$ which python3
/home/hakon/.pyenv/shims/python3

I created a desktop file (file location: ~/.local/share/applications/my-tk-app.desktop):

[Desktop Entry]
Type=Application
Terminal=false
Name=My Tk Application
Exec=/home/hakon/my-tkapp.py
Icon=/home/hakon/icons/my-tk-app-icon.png
StartupWMClass=MyTkApp

For the icon, I just (for the purpose of testing) copied one of the standard icons:

cp /usr/share/icons/hicolor/48/apps/apport.png /home/hakon/icons/my-tk-app-icon.png

Running the desktop-file-validate command on the desktop file gives no output, so the desktop file should be OK.

However, when I run the python script from the terminal:

~/my-tkapp.py

I still get the generic question mark icon in the launcher.

What am I overlooking here?

I would like to change the keyboard shortcuts for "Previous Page" and "Next Page" in evince. I have a Dell Vostro 5568 laptop where the PgUp and the PgDn keys are located awkwardly up to the right on the keyboard. Instead I would like to use Ctrl+Left and Ctrl+Right (currently bound to "Rotate Left" and "Rotate Right"), or alternatively to use Ctrl+Up and Ctrl+Down.

From the Gnome Help page I figured I had to use dconf-editor. Here are two screenshots showing my settings:

Now when I click "Go" menu in Evince, and move the mouse pointer down to menu item "Previous Page", I should be able to enter a new keyboard shortcut. But if I press Ctrl+Up and close Evince and reopens it, the shortcut does not work. Here is a screenshot from Evince:

I am using Ubuntu 16.10. There is also an older question for Ubuntu 10.10 here.

The following command worked fine on Ubuntu 15.10:

sudo apt-get build-dep emacs24

However, on Ubuntu 16.04 I get the following error when running it:

Reading package lists... Done
E: You must put some 'source' URIs in your sources.list

In 15.10 all lines (around 10 in number) with deb-src in /etc/apt/sources.list where uncommented, whereas in 16.04 the corresponding lines where commented out. For example, here are 4 lines from my current sources.list:

## Major bug fix updates produced after the final release of the
## distribution.
deb http://no.archive.ubuntu.com/ubuntu/ xenial-updates main restricted
# deb-src http://no.archive.ubuntu.com/ubuntu/ xenial-updates main restricted

What is the reason for this change?

Next, I would like to avoid manually edit /etc/apt/sources.list each time I do a reinstallation of Ubuntu. How can this (uncommenting the deb-src lines) be done automatically?

After upgrading form Ubuntu 14.10 to 15.10, it seems that changing gnome-terminal preferences using gconftool-2 is no longer supported. I guess this issue is related the Gconf to GSettings migration.

Now, I would like to change some of my old scripts ( since they are broken in Ubuntu 15.10 ) to work with dconf/gesettings instead of gconftool-2.

As an example, on Ubuntu 14.10 ( gnome-terminal version 3.6.2 ) I could set the number of columns in the Default profile using:

$ gconftool-2 --set /apps/gnome-terminal/profiles/Default/default_size_columns \
            --type=int 140
$ gconftool-2 --set /apps/gnome-terminal/profiles/Default/use_custom_default_size \
            --type=bool true

Now, in Ubuntu 15.10, typing:

$ dconf list /org/gnome/terminal/legacy/

gives

profiles:/
schema-version

whereas

$ gsettings list-relocatable-schemas | grep Terminal

gives

org.gnome.Terminal.SettingsList
org.gnome.Terminal.Legacy.Profile
org.gnome.Terminal.Legacy.Keybindings

The above output confuses me:

• Why is there a /org/gnome/terminal/legacy/profiles:/ path for dconf but no org.gnome.Terminal.Legacy.Profiles (note the trailing s) schema id for gsettings? Also, see Shouldn't dconf-editor and gsettings access the same database? for more information.

Still in Ubuntu 15.10 (using gnome-terminal version 3.16.2), if I run:

$ gsettings list-keys org.gnome.Terminal.Legacy.Profile:/ | grep default

I get:

default-size-rows
default-show-menubar
default-size-columns

so there is a default-size-columns key that could (?) correspond to the default_size_columns key in Ubuntu 14.10, but there is no use-custom-default-size key corresponding to the use_custom_default_size key in Ubuntu 14.10. This also confuses me.

Also, if I try running:

$ gsettings set org.gnome.Terminal.Legacy.Profile:/ default-size-columns 150

and open a new gnome-terminal the setting of default-size-columns seems to have no effect since the terminal still opens with 80 columns..

When I open gnome-terminal with multiple tabs from the command line, I would like to preselect (on the command line) which one of the tabs should get focus.

I tried

gnome-terminal --tab -t A --active --tab -t B

to set tab A as the active, but instead tab B becomes the active one.

I would like to upgrade gnome-terminal to the latest version. Is that possible on Ubuntu 14.04 LTS?

I am using version 3.6.2 of gnome-terminal.

I have tried:

sudo apt-get install --only-upgrade gnome-terminal

and it says gnome-terminal is already the newest version.

I would like to add Ipython qtconsole (for Python3) to the application launcher in the bottom panel at the KDE plasma desktop. I currently have three applications in the launcher:

• chromium browser
• Ipython qtconsole (Python2)
• konsole

Se below screen shot:

The problem is that I cannot remember how I added these applications in the first place. Now I would like to add Ipython qtconsole. If I right-click on the konsole icon in the laucher it pops up a menu with to items Icon settings and Panel options, but none of these sub menues allows me to modify the application launcher.

(The path to Ipython qtconsole is /usr/bin/ipython3.)

I am using Ubuntu 14.04 with Python 2.7.6. I have installed matplotlib for Python 2. Now, I just installed Python 3.4.2 using pyenv install 3.4.2. I then ran pip install matplotlib to install matplotlib for Python 3. I later discovered the package python3-matplotlib for Ubuntu 14.04. I wonder: should I have used sudo apt-get install python3-matplotlib instead? What is the preferred way of installing matplotlib for Python 3 side-by- side with the Python 2 matplotlib?

I decided I wanted to try Kubuntu since I had some difficulties with the Unity desktop. I do not remember exactly the command(s) I run, but I think I used sudo apt-get install kubuntu-desktop. Now the fonts are messed up both in KDE Plasma Desktop and in Unity. Here is an example from a web mail page:

Here is how it should look like (and how it looked like before installing Kubuntu) :

Here is what I have tried:

• I tried to look for a file ~/.fonts.conf and disable font hinting, see this answer: Ugly font after KDE installation. I also tried the modifications suggested in this answer: Web fonts became ugly after installing KDE

• I tried run sudo apt-get purge pango-graphite suggested in this answer: font-messed-up

Update:

It seems the font problem depends on the browser also. I made this small test HTML script:

<html>
    <body style="font-family: Sans-Serif;">
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur laoreet eros tortor, quis sodales quam ullamcorper tincidunt. Nunc a dolor ac urna sollicitudin aliquam ut id sem. Integer in sem magna. Phasellus tincidunt, nunc nec mattis facilisis, metus risus ultrices leo, quis convallis lorem nulla nec ante. Proin consectetur, mauris nec iaculis gravida, risus mi blandit ante, a sollicitudin neque diam ut nisi. Praesent nec leo quis sem accumsan dignissim. Ut ornare consectetur scelerisque. Etiam vel dapibus est. Phasellus imperdiet ipsum ut commodo tincidunt. Quisque malesuada et ante eu rutrum. Nulla porttitor blandit dui at sollicitudin.
    </body>
</html>

Note that the font family is Sans-Serif (it seems like the problem is most pronounced when font-family is set to only Sans-Serif)

Result in Chromium browser:

The page looks much better in Firefox:

According to the TeX Live website TeX Live 2014 was released one week ago (14 June 2014). How do I upgrade from TeX Live 2013 to TeX Live 2014 on Ubuntu 14.04 ?