[Bug 37212] Cannot manually add secondary groups

[Steph]

Public bug reported:
https://launchpad.net/malone/bugs/37212

Affects: kde-systemsettings (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
Using Flight 5 of Kubuntu (all packages upgraded via apt-get), I can not
manually add secondary groups to a user.

How to reproduce :
- Open System Settings, and User & Groups
- Click on Administrator mode
- Click on New in order to add a new user
- In the Secondary Groups field, type "cdrom"
- Click OK
- Check the secondary groups of the new user : the "cdrom" group is not mentionned.

If you select the groups using the Choose button and the list, it works.
If you manually type the groups, it does not work.