Re: [tlug] Trouble with external USB hard disk

[Francois Cartegnie <fcartegnie@example.com>]

> david@example.com:~$ sudo mount /etc -n
> sudo: uid 1000 does not exist in the passwd file!
>
> david@example.com:~$ sudo mount /root
> sudo: uid 1000 does not exist in the passwd file!
>
> Does this information help?

I'd say "david" is uid 1000 and doesn't have entry in /etc/passwd and your 
fstab entry references is by "user".
- check your /etc/passwd and /etc/shadow
- try to mount with commenting the fstab entry first.