Comment 10 for bug 1668429

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Daniel van Vugt (vanvugt) wrote : Re: X apps (LibreOffice, Firefox) fail to launch with failure to open display (no Xmir is running)

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.