Don't you have ubuntu tweak installed? If so, don't you have set under
Tweaks > Session indicator "Disable lock screen?" If unsetting it
corrects your problem, could you set this to invalid? Otherwise, set it
to confirmed.
** Changed in: gnome-control-center (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/882180
Title:
Cannot set keyboard shortcut for "Lock Screen"
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