Comment 7 for bug 1822394

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Daniel van Vugt (vanvugt) wrote : Re: laptop keyboard & touchpad not working at gdm screen after boot

Actually, a big problem I can see is that your journal.txt (system log) is full of:

Mar 30 14:28:00 taplop gnome-shell[5876]: Failed to flip onscreen: Tried to flip inactive CRTC
Mar 30 14:28:01 taplop gnome-shell[5876]: Failed to flip onscreen: Tried to flip inactive CRTC
Mar 30 14:28:01 taplop gnome-shell[5876]: Failed to flip onscreen: Tried to flip inactive CRTC

That's a Wayland-specific issue so please do try logging into Xorg (just "Ubuntu").