Found the problem. Had any of us looked at unity8-dash.log (attached) we would have seen it.
The problem is that MainView uses Ubuntu.PerformanceMetrics but that package is never installed. Solution: sudo apt install qml-module-ubuntu-performancemetrics So the bug is just Unity8 missing a hard dependency on that package which it requires. ** Changed in: unity8 (Ubuntu) Status: New => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1577639 Title: Scopes and System Settings (all my QML apps) show just blank white windows [missing package qml-module-ubuntu-performancemetrics] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-ui-toolkit/+bug/1577639/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs