Found my problem. It was an existing symlink /media/usbdisk -> /media/sdc1. And automatic mount failed because the file 'usbdisk' was already there.
-- After upgrading to KDE 3.5.5 USB pen drives doesn't mount automatically https://launchpad.net/bugs/66307 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
