Not actually an X bug...
Run the Display configuration tool. You should be able to drag the
toolbar image to the screen you wish to be primary.
Feel free to reopen if you find it doesn't do what you expect.
** Package changed: xorg (Ubuntu) => unity (Ubuntu)
** Changed in: unity (Ubuntu)
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https://bugs.launchpad.net/bugs/921311
Title:
no way to specify the primary display with unity
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