Thanks for the swift replies. This is the output of df -h: Code: Filesystem Size Used Avail Use% Mounted on /dev/sda4 510M 326M 158M 68% / udev 10M 196K 9.9M 2% /dev /dev/sda5 4.0G 240M 3.6G 7% /var /dev/sda6 510M 19M 466M 4% /tmp /dev/sda7 9.9G 6.6G 2.9G 70% /usr /dev/sda8 895G 168G 682G 20% /home shm 2.0G 0 2.0G 0% /dev/shm /dev/sdb1 230G 162G 56G 75% /media/disk None of my partitions seem full, so no problems there. The permissions of my /home directory are all drwxrwxrwx or -rwxrwxrwx, I can't imagine that's the problem either. I don't want to mount /usr with the exec option, as that would be a huge security risk. Is there anyone who has a clue?