I've forwarded that issue upstream:
http://bugzilla.gnome.org/show_bug.cgi?id=350245
** Changed in: gnome-system-tools (Ubuntu)
Importance: Untriaged => Low
Assignee: (unassigned) => Ubuntu Desktop Bugs
Status: Unconfirmed => Confirmed
** Bug watch added: GNOME Bug Tracker #350245
http://bugzilla.gnome.org/show_bug.cgi?id=350245
** Also affects: gnome-system-tools (upstream) via
http://bugzilla.gnome.org/show_bug.cgi?id=350245
Importance: Unknown
Status: Unknown
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Don't accept underscore "_" in usernames
https://launchpad.net/bugs/49296
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