impossible to add network printer in Edubuntu

[LAZA]

I tried to add a network printer and gnome-control-center fails:

I do:
Applications - System Tools - System Settings - Hardware - Printers
Add new Printer leads to the "gnome-control-center" and by choosing "Network" i get this error message:

FirewallD is not running.
Network printer detection needs services mdns, ipp, ipp-client and samba-client enabled on firewall.

The option "Add" is not allowed (greyed out), even i give the right address and port...
The search needs a long time and comes back with nothing.

On my two other machines (Xubuntu 12.04 and 12.10) it works flawless to add the printer and printing itself!

If there is an package missing, why would it not installed at least when i try to add a network printer?

.

Edubuntu 12.04.2
Linux ThinkPad-R61 3.2.0-38-generic-pae #61-Ubuntu SMP Tue Feb 19 12:39:51 UTC 2013 i686 i686 i386 GNU/Linux

dpkg -l | grep 'gnome-control-center'
ii gnome-control-center - 1:3.4.2-0ubuntu0.9 - utilities to configure the GNOME desktop
ii gnome-control-center-data - 1:3.4.2-0ubuntu0.9 - configuration applets for GNOME - data files
ii libgnome-control-center1 - 1:3.4.2-0ubuntu0.9 - utilities to configure the GNOME desktop

[Sebastien Bacher (seb128)]

thank you for your bug report, do you have cups-pk-helper installed?

[LAZA (laza74)]

Yes, it is installed:

~$ dpkg -l | grep cups-pk-helper
ii cups-pk-helper 0.2.1.2-1ubuntu0.1 PolicyKit helper to configure cups with fine-grained privileges

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.