Sounds like this may be bug 1724259 (fixed last night).
Please try updating your system, make sure you then have libinput 1.8.4
installed, reboot and retest.
** Changed in: gdm3 (Ubuntu)
Status: Confirmed => Incomplete
** Changed in: gnome-shell (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1741839
Title:
gdm3 lock screen/gnome-shell freeze after opening laptop lid
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