Ok, I did some checks and research myself:
1) as it seems dnssd does not work over WLAN 2) seemingly it is a problem with my router (at least I see no other cause for the problem). So what now? The problems with dnssd over WLAN appeared only AFTER the upgrade from Ubuntu 11.10 to 12.04LTS. So the WLAN router cannot be the only cause of these problems, I have here. Before the upgrade I could print via WLAN. The router is a Speedport W303V Type A -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/987212 Title: Wireless printer "Processing - Unable to locate printer." To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/system-config-printer/+bug/987212/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
