Hi Csányi, I suspect you have a corrupt memory or some other hardware issue. First check if your disk is not full by issuing "df" command. Then select memtest from grub menu and leave it for a few hours of testing, you will probably see errors.
-- Gokdeniz Karadag -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org