I have the same issue and haven't found a workaround
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https://bugs.launchpad.net/bugs/1622823
Title:
Desktop Wall - MultiMonitor Behavior is ignored
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Public bug reported:
This is a fresh install of Ubuntu 18.04. My boot time is extremely slow
(I have attached the systemd boot log), and often, after login I get an
orange screen with cursor and nothing else. When I do get to the
desktop, Simple Screen recorder can't record with h264, even