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--- kubuntu [2015/11/02 09:58]
mstraub
+++ kubuntu [2019/11/07 09:53]
mstraub
@@ Line 1: / Line 1: @@
+====== Kubuntu Wrestling ======
+===== Menu =====
+Instead of using kmenueditor a quick way to add new entries to the start menu is by creating a .desktop file here:
+<code>
+~/.local/share/applications/
+</code>
+E.g.
+<file anaconda-navigator.desktop>
+[Desktop Entry]
+Name=Anaconda
+Comment=anaconda-navigator
+Exec=/usr/bin/env PATH=/home/mstraub/anaconda3/bin/:$PATH /home/mstraub/anaconda3/bin/anaconda-navigator
+Icon=/home/mstraub/anaconda3/lib/python3.7/site-packages/anaconda_navigator/static/images/logos/continuum_twitter.jpg
+Terminal=false
+Type=Application
+StartupNotify=true
+</file>
+===== Kubuntu 18.04 Troubleshooting =====
+Solving my problems with a Lenovo Thinkpad T450s:
+I ended up putting the following scripts in ''/lib/systemd/system-sleep''.
+This script fixes that touchpad scrolling with a two finger gesture does not work anymore after resume:
+<file bash fix-touchpad.sh>
+#!/bin/bash
+case "$1" in
+    post)
+        modprobe -r psmouse
+        modprobe psmouse
+        echo "modprobe script finished @ `date`" >> /tmp/modprobescript
+        ;;
+esac
+</file>
+And this script is an ugly workaround for notifications and global shortcuts not working anymore after resume (see also https://bugs.kde.org/show_bug.cgi?id=396682)
+<file bash fix-global-shortcuts-and-notifications.sh>
+#!/bin/bash
+sleep 6
+export DISPLAY=:0
+sudo -u markus kcmshell5 khotkeys &
+sleep 1
+killall kcmshell5
+</file>
+===== Inkscape Tooltips =====
+To avoid nearly unreadable (white on white) tooltips in Inkscape disable ''Apply colors to non-Qt applications'' in the KDE System Settings under Colors.
+https://askubuntu.com/questions/725642/inkscape-tooltips-unreadable
+===== Eclipse & SVN =====
+Using Eclipse 2018.09 and Kubuntu 18.04:
+Subclipse by default uses JavaHL - this does not work well, for each svn update it takes Gigabytes of RAM and a long time. What works: switch to the pure Java implementation (SVNKit) in Preferences > SVN!
+Subversive is no longer maintained, don't use it!
+===== File Associations / Default Applications =====
+Note: this research was done on Kubuntu 15.10 using KDE 5
+Nowadays MIME types and .desktop files are involved in deciding which programs are used to open a certain file. See these wiki entries for [[https://wiki.archlinux.org/index.php/Default_applications|Arch Linux (recommended in-depth explanation)]] and [[https://wiki.debian.org/MIME|Debian]].
+KDE uses ''ktraderclient5'' to determine the default program. Also ''xdg-open'' uses this program (see the function defapp_kde() in xdg-mime or the output of ''xdg-mime query default application/pdf''). It returns useful defaults such as using Okular to open pdfs even if Gimp is installed (''ktraderclient5 --mimetype application/pdf''). However, programs not relying on ''ktraderclient5'' (such as Firefox) won't get these defaults as they are not stated in any ''mimeapps.list'' file. (FIXME: where do the defaults actually come from? [[http://api.kde.org/frameworks-api/frameworks5-apidocs/kservice/html/kmimetypetrader_8cpp_source.html|Maybe dig into the code...]])
+As soon as you explicitly configure program preferences with Dolphin the defined program order is written to ''~/.local/share/applications/mimeapps.list''. The order of entries displayed in Dolphin is reflected in the section [Added Associations]. The section [Default Applications] is filled in as well, but it seems that KDE ignores the default set there and sticks to the first program in [Added Associations].
+The most useful way I identified to get consistent for all applications (KDE and non-KDE) is to explicitly set defaults in ''~/.local/share/applications/mimeapps.list'', which will be updated for all programs when using the GUI method in Dolphin.
+<code>
+[Default Applications]
+application/pdf=kde4-okularApplication_pdf.desktop;
+application/postscript=kde4-okularApplication_ghostview.desktop;
+image/bmp=org.kde.gwenview.desktop;
+image/gif=org.kde.gwenview.desktop;
+image/jp2=kde4-okularApplication_kimgio.desktop;
+image/jpeg=org.kde.gwenview.desktop;
+image/png=org.kde.gwenview.desktop;
+image/svg+xml=inkscape.desktop;
+image/tiff=org.kde.gwenview.desktop;
+</code>
+===== Missing Ark Context Menus =====
+<code>
+sudo ln -s /usr/share/kde4/servicetypes/konqpopupmenuplugin.desktop /usr/share/kservicetypes5/
+</code>
+http://www.linuxgnut.com/dolphin-extract-menus-missing-in-kubuntu-1510
+===== KDE 4 & Eclipse problems =====
+==== Freezes when Debugging GUIs ====
+Using KDE 4.11 (Kubuntu 14.04) the whole workspace freezes when debugging GUIs, e.g. Java FX. Only switching to the console and killing the started program makes the desktop responsive again.
+Solution: pass the VM argument ''-Dsun.awt.disablegrab=true''.
+Source: https://bugs.eclipse.org/bugs/show_bug.cgi?id=20006
+Alternative solution: System Settings > Application Appearence > GTK > use "Raleigh" as GTK2 theme
+The xfce gtk2 engine should also work (and is less ugly): apt install gtk2-engines-xfce

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