The upgrade from version 9.10 was flawlessly. It takes some time to be completed.
But after the installation I have all the time system crashes. This never happened before.
I have a P5P800SE motherboard, a 3.06 GHz Celeron processor, 512 MB of memory and ubuntu is installed under windows XP professional version 2002 and service pack 3.
If somebody has an answer I will be glad to hear it. Otherwise I move back to version 9.10