This worked for me:
sudo apt install slick-greeter
printf '[Seat:*]\ngreeter-session=slick-greeter\n' | sudo tee -a
/etc/lightdm/lightdm.conf
(maybe that means this bug is actually in lightdm-gtk-greeter?)
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https://bugs.launchpad.net/bugs/1821296
Title:
light-locker blank screen until switching vt back and forth
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