Users and Groups : allowed me to create a user called Admin

[Richard Weideman]

Binary package hint: gnome-system-tools

--- REPORT ---

Using:
System > Administration > Users and Groups
I used:
[Add User]
And created a user called:
Name: Vodacom 3g Admin
Login name: admin

This caused me some grief later
When I try to unlock the User Settings with my sudo password I get this dialogue:

"Could not authenticate"
An unexpected error has occurred.

--- MORE ---

When chatting to ogra, he tells me:
<ogra> the system group used to obtain sudo rights is called admin
<ogra> you shouldn't be able to add a user called admin at all

--- VERSION ---

Ubuntu 8.04 Hardy

[Chris Coulson (chrisccoulson)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 236305, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.

[Richard Weideman (richard-weideman)]

Advice on how to recover from this would be helpful.

When I try to unock the User Settings with my sudo password I get this dialogue:
"Could not authenticate"
An unexpected error has occurred.

I've manually removed the user admin from:
/etc/passwd
/etc/shadow
/etc/sudoers

But when I look at:
/etc/group
I find:
admin:x:1001:

Which appears as if admin now has user ID and not a group ID