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.
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.