Installed 'update-notifier' with 'apt' and added 'root' to 'admin' group.
But when i try to run it under 'su' the output is:
(update-notifier:14095): GnomeUI-WARNING **: While connecting to session manager:
Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed.
libnotify-Message: Unable to get session bus: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.