Ubuntu 17.10 Screen lock not working and grey
Lock screen needs to be enabled:
gsettings get org.gnome.desktop.lockdown disable-lock-screen
false
If result is true
then use:
gsettings set org.gnome.desktop.lockdown disable-lock-screen false
Lock screen needs to be enabled:
gsettings get org.gnome.desktop.lockdown disable-lock-screen
false
If result is true
then use:
gsettings set org.gnome.desktop.lockdown disable-lock-screen false