Bug#572406: "users" Mount Option Broken
> The "users" option got broken with the latest release, despite working
> correctly in 1:1.0.10-6+etch.1 (old stable). Non-root users can mount
> filesystems listed in /etc/fstab that have "users" specified, but they
> will be unable to unmount the filesystem
> ("umount.nfs: You are not permitted to unmount ...").
> My first thought is someone confused the "user" (which would need to
> check who mounted the FS) and "users" option. Given bug report #501459,
> part of which sounds like a similar issue with cifs, I'm also wondering
> if the interface between `mount` and `mount.<fstype>` got changed
Does adding a trailing slash in /etc/fstab fix the issue for you?