Comment 9 for bug 43612

I'm having this problem as well, trying to install a printer over samba.
The error is:
"Unable to create printer. Error message received from manager: The requested operation cannot be completed."

It occurs during installation, right after the driver has been installed (the first time it allows you to print a test page).

running from shell gives:

naught101@naught101-laptop:~$ sudo kcmshell printers
Error: "/var/tmp/kdecache-naught101" is owned by uid 1000 instead of uid 0.
QObject::connect: No such slot KMMainView::slotServerAccessConfigure()
QObject::connect: (sender name: 'server_access_configure')
QObject::connect: (receiver name: 'MainView')
Error: "/tmp/kde-naught101" is owned by uid 1000 instead of uid 0.
^[[A^[[A^[[BDomain=[ACCOUNTS] OS=[Windows 5.1] Server=[Windows 2000 LAN Manager]
Domain=[ACCOUNTS] OS=[Windows 5.1] Server=[Windows 2000 LAN Manager]
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LANGUAGE = (unset),
        LC_ALL = (unset),
        LANG = "en"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

naught101@naught101-laptop:~$ uname -a
Linux naught101-laptop 2.6.24-20-rt #1 SMP PREEMPT RT Mon Jul 28 16:03:43 UTC 2008 i686 GNU/Linux
Hardy Kubuntu