I managed to fix it in the following way:
1. Install dconf-editor (to edit the "registry keys")
sudo apt install dconf-editor
2. Open dconf-editor as a normal app; search for:
/org/gnome/desktop/lockdown/
3. In my case, the disable-lock-screen was set turned on. I turned it
off and everything
** Summary changed:
- Can't lock screen with keyboard shortcuts when using lightdm
+ Can't lock screen when using lightdm with gnome-shell
** Tags removed: eoan
** Tags added: focal
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