umount: not coherent with fstab

Derek Broughton news at
Tue May 22 18:38:53 UTC 2007

Luca Ferrari wrote:

> On Tuesday 22 May 2007 Mitch Contla's cat, walking on the keyboard, wrote:
>> Why dont you type 'mount' and see how the os thinks the file systems are
>> mounted. Maybe this will give you a clue as to why your umount is not
>> working. Are you using umount as root?
> The mount command reports me the filesystem is ok with fstab. If I umount
> as root it works, then I can re-mount as normal user, but cannot umount as
> normal user. But the mount point belongs to the user and my fstab contains
> the users option:
> # /dev/sda12
> UUID=E63F-7400  /mnt/disco2     vfat
> defaults,utf8,umask=000,users,exec,suid 0       1
> [luca at fluca:~]$ mount | grep disco1
> /dev/sda11 on /mnt/disco1 type vfat (rw,nodev,utf8,umask=000)
> What am I missing?

Other than the fact that you displayed the mount values for disco1, not

How about "umount -n"?  I wonder if the problem is that umount has to write
to /etc/mtab?

btw, are you sure you really want it to be mounted with the "users" option
and not "user"?  aiui, if user "luca" mounts disco2, user "acul" could
umount it (provided it's not in use).  If you use "user", then after "luca"
mounts the fs, only "luca" or "root" can umount it.

More information about the ubuntu-users mailing list