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
** Visibility changed to: Public
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root console with broken /etc/fstab
https://launchpad.net/bugs/52892
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