@abmoraz (abmoraz) :
I'm actually using a nvidia graphics card.
01:00.0 VGA compatible controller: NVIDIA Corporation GT216M [NVS 5100M]
(rev a2)
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https://bugs.launchpad.net/bugs/1173349
Now i installed Kubuntu 12.04.2 LTS and made the upgrade to Kubutu 13.04.
After the first reboot the plasma-desktop ran without any crashes but began
than to crash again.
Therefore i deleted the plasma config files ~/.kde/share/config/plasm* as
described by Adam Maćkowiak (admc) and since then
After complete reinstall of 13.04 and adding some custom application,
plasma-desktop crashes every time i log in.
same happens, if i restart plasma-desktop manually after the crash occured.
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db