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a60fb26
(Get the code!)
@Stéphane: Sorry, I didn't see this sooner. I must have forgotten to subscribe. (oops)
In Xubuntu Final (iso 20200420.1), there is no Security tab in the Power Manager. Only a "security" checkbox which controls "Lock screen when system is going to sleep". I had a look in the configuration editor in case something was hiding there - nothing relevant there.
My sequence of actions is:
*Create new user.
*Open a program (usually Thunar or Terminal).
*Lock session.
*Log in as new user which I just created.
*Log out of new user's session.
*Select my original user.
*Enter password to unlock.
*Then there's a delay and screen goes black, then the unlock prompt appears again.
*The second time, the original session unlocks.
It's occurred to me that this just might be an issue with the QEMU/KVM vm, if no one else is having problems. I don't have a spare machine for testing, unfortunately, though I might be able to do something with an external drive. If I get a chance later today, I see what I can do.