This is by design. Note that: a) you needed root privileges to modify /etc/fstab, and b) there are plenty of other ways to get root if you have access to the console; it isn't secure by default in most Linux distributions
** Changed in: util-linux (Ubuntu) Status: Unconfirmed => Rejected -- root console with broken /etc/fstab https://launchpad.net/bugs/52892 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs