I managed to overflow my home partition and the system frooze.
Now when I reboot I can log into my account and XFCE but according to the panel there is no partition mounted, applications tell me there is no space and refuse to work and the desktop is partially messed. I ereased some files with the root account, so the space should be there again. Thunar shows the files and directories.
But I can not use VASM, I can not shut down, there is no connection to the net (I use now my testing partition)
It would be gratefull if somebody could give me a hint how to clear this mess and to have access to the desktop again.