Xubuntu 20.04 fails to sleep HDMI monitors unless light-locker is installed.
Repeatable on LiveUSB.
Maybe there are some dependencies that are not fully removed.
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Xubuntu no longer ships light-locker-settings. We dropped it back in
vivid.
https://launchpad.net/ubuntu/+source/xubuntu-meta/2.187
http://cdimage.ubuntu.com/xubuntu/daily-live/current/focal-desktop-
amd64.manifest
** Changed in: xubuntu-meta (Ubuntu)
Status: Confirmed => Invalid
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