I have lost sudo privileges in Ubuntu 13.04 [duplicate]

Posted by Fredca on Ask Ubuntu See other posts from Ask Ubuntu or by Fredca
Published on 2013-10-24T08:36:56Z Indexed on 2013/10/25 16:12 UTC
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I have lost sudo privileges in Ubuntu 13.04 these are the responses I get

user@user-desktop:~$ sudo

sudo: effective uid is not 0, is sudo installed setuid root?

user@user-desktop:~$ groups user

user : user adm cdrom sudo dip plugdev lpadmin sambashare

user@user-desktop:~$ su user

Password:

su: Authentication failure

user@user-desktop:~$ who am i

user pts/0 2013-10-24 08:54 (:0.0)

user@user-desktop:~$ 

why can't I invoke sudo if one of my groups is sudo?

also I have noticed that /etc/sudoers needs sudo privileges. sudoers.so doesn't exist in /usr/lib but does in /usr/lib/sudo is this correct in 13.04?

Please note that the user is already a member of both sudo and adm groups.

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