Error: GDK_BACKEND does not match available displays

amurleopard

If you see this error. It is most likely because your display is not set, maybe because you have ssh'ed from one machine to another and the display has not been set.

For instance, echoing the DISPLAY variable returns nothing.

$ firefox
Error: GDK_BACKEND does not match available displays
$ echo $DISPLAY

From your source machine, give this a try.

$ ssh -X trainer@your-machine 
$ echo $DISPLAY
localhost:10.0

-X Enables X11 forwarding. This can also be specified on a per-host basis in a configuration file.