Somehow you've got the sip4 from raring (to be 13.04) on a 12.10 system. The version of sip4 shipped in 12.10 has the correct sip-api.
sip4 | 4.13.3-2 | quantal | source ** Changed in: sip4 (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1088900 Title: Muon software manager lost after ugrade python3-sip library To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/sip4/+bug/1088900/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs