Comment 3 for bug 1463263

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Daniel van Vugt (vanvugt) wrote : Re: X11 Forwarding is broken following upgrade to Ubuntu Server 15.04 from 14.10

The "gdk_mir_display_open" error is just GDK/GTK trying to use Mir because it found no X11 server ($DISPLAY is blank). That's not a Mir bug.

 You are not trying to use Mir, and Mir does not seem to be responsible for the breakage either. If the system was not broken then $DISPLAY would be set to something correct (like ":0") and GDK would not be trying to fall back to Mir.