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").
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").