Please run this command and tell us what you get:
gsettings get org.gnome.desktop.lockdown disable-lock-screen
Also your lock delay is set to 1800 (30 minutes?) so please try:
gsettings set org.gnome.desktop.screensaver lock-delay 0
gsettings set org.gnome.desktop.screensaver lock-enabled true
and then log out and in again to be sure.
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1880785
Title:
Cannot enable 'Lock screen on suspend'
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