Further to comment 5, I've had a further look in the live environment
and it appears the screen isn't locked out when I switch user - so I can
use Ctrl-Alt-F{1..8} to switch between things. This suggests to me that
the screen-locking code path isn't getting tested when I try this from
the Live USB.
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https://bugs.launchpad.net/bugs/1809117
Title:
Screen corruption on "Lock Screen" or "Switch User" command
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