Found the problem. My fault, one custom widget plugin with an "import PyQt4"
Sorry for the noise. Vincent ** Changed in: pyqt5 (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1603793 Title: designer-qt5 crash at launching with a sip.cpython error To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pyqt5/+bug/1603793/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs