[kubuntu dapper] Cannot enable administrator mode in Users&Groups administration

Can you run "kcmshell userconfig" in terminal and reproduce the problem?
Then please attach the output.

Pythonize constructor -- pid = 5796
Traceback (most recent call last):
  File "<string>", line 8, in kcontrol_bridge_create_userconfig
  File "/usr/lib/python2.4/site-packages/userconfig.py", line 1683, in create_userconfig

return UserConfigApp(parent, name)
  File "/usr/lib/python2.4/site-packages/userconfig.py", line 267, in __init__

self.admincontext = unixauthdb.getContext(isroot)
  File "/usr/lib/python2.4/site-packages/unixauthdb.py", line 58, in getContext

return PwdContext(editmode)
  File "/usr/lib/python2.4/site-packages/unixauthdb.py", line 731, in __init__

fhandle = codecs.open(shadowfile,'r',locale.getpreferredencoding())
  File "/usr/lib/python2.4/codecs.py", line 666, in open

file = __builtin__.open(filename, mode, buffering)
IOError
:
[Errno 2] Nie ma takiego pliku ani katalogu: '/etc/shadow'

error: *** runFunction failure

Can you provide output of the following command:

  ls -l /etc/shadow

On my system it reports:
  -rw-r----- 1 root shadow 850 2006-04-29 20:44 /etc/shadow

There was a bug that changed group ownership from "shadow" (as above) to "root". Maybe you are hit by this.
In such case, running "sudo chgrp shadow /etc/shadow" may fix the problem.

Seems to work here today with latest kubuntu-dapper updates (kde-guidance 0.6.5-0ubuntu2)

Works here too. Marking bug as "Fix released". Please re-open if you see that again.