The solution it seems is for Unity8 to have an Xmir -rootless started and ready at login to support legacy X apps (that are not pure GTK). Only problem with that is that you will then hit bug 1577641.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1668429 Title: X apps (LibreOffice, Firefox) fail to launch with failure to open display (no Xmir is running) To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1668429/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs