Tips and tricks

1. Check for updates with a GUI in Kubuntu.

   • Kmenu -> Run Command -> Type 'kdesu adept_updater'

2. If you want to search and replace a certain string in multiple files use perl like this:

   •    $ perl -i -p -e 's/search/replace/g' *.txt 

3. Out of memory problems with MOL and Tiger?

   • Get a new bootx from http://www-user.rhrk.uni-kl.de/~nissler/mol/bootx.gz like this:

        $ wget http://www-user.rhrk.uni-kl.de/~nissler/mol/bootx.gz
        
        #  dpkg-divert --add --rename /usr/share/mol/drivers/bootx
     
        # gzip -c bootx.gz > /usr/share/mol/drivers/bootx 

4. Need to execute X programs from the commandline with root privileges?
   • Error: cannot connect to X server :0.0 Fix: Run this command as the user logged in to the X session:

        $ xhost +si:localuser:root 

     This will allow root connections to the X server. I have this command in ~/.kde/Autostart/x-allow-root.sh Make sure your script is executable

     chmod +x ~/.kde/Autostart/x-allow-root.sh 

5. Make kdesu ask the root password, instead of the user password.
   • This is done in ~/.kde/share/config/kdesurc, it should look like this when su is selected:

        frode@light:~ $ cat ~/.kde/share/config/kdesurc
        [super-user-command]
        super-user-command=su
        frode@light:~ $ 

     This is a per-user setting. If you want it system wide, put the file in /usr/share/kubuntu-default-settings/kde-profile/default/share/config/ instead. You might need to update the system config cache:

        frode@light:~ $ kbuildsycoca --incremental 

     Now 'kdesu' use 'su' for it's authentication needs. This of course depends on a enabled root account which Ubuntu/Kubuntu does not have by default.