I can reproduce this on Hardy:
[EMAIL PROTECTED]:/media/sdb1/etc$ sudo adduser guest
Adding user `guest' ...
Adding new group `guest' (1002) ...
Adding new user `guest' (1002) with group `guest' ...
Creating home directory `/home/guest' ...
Copying files from `/etc/skel' ...
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
Changing the user information for guest
Enter the new value, or press ENTER for the default
Full Name []:
Room Number []:
Work Phone []:
Home Phone []:
Other []:
Is the information correct? [y/N] y
[EMAIL PROTECTED]:/media/sdb1/etc$ sudo su guest
[EMAIL PROTECTED]:/media/sdb1/etc$ sudo echo hi
[sudo] password for guest:
[EMAIL PROTECTED]:/media/sdb1/etc$ sudo echo hi
[sudo] password for guest:
[EMAIL PROTECTED]:/media/sdb1/etc$ sudo echo hi
[sudo] password for guest:
[EMAIL PROTECTED]:/media/sdb1/etc$
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sudo (edgy) silently fails when user is not a member of admin
https://bugs.launchpad.net/bugs/81140
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