Comment 3 for bug 1851790

journal logs after launching cheese:

nov 08 19:04:29 RooTBoX dbus-daemon[2458]: [session uid=1000 pid=2458] Activating service name='org.gnome.Cheese' requested by ':1.52' (uid=1000 pid=2671 comm="/usr/bin/gnome-shell " label="unconfined")
nov 08 19:04:29 RooTBoX dbus-daemon[2458]: [session uid=1000 pid=2458] Successfully activated service 'org.gnome.Cheese'
nov 08 19:04:29 RooTBoX /usr/lib/gdm3/gdm-x-session[2429]: (II) modeset(0): EDID vendor "BOE", prod id 1833
nov 08 19:04:29 RooTBoX /usr/lib/gdm3/gdm-x-session[2429]: (II) modeset(0): Printing DDC gathered Modelines:
nov 08 19:04:29 RooTBoX /usr/lib/gdm3/gdm-x-session[2429]: (II) modeset(0): Modeline "1920x1080"x0.0 141.40 1920 1968 2000 2142 1080 1083 1089 1100 +hsync -vsync (66.0 kHz eP)
nov 08 19:04:29 RooTBoX xdg-desktop-por[2611]: Failed to get application states: GDBus.Error:org.freedesktop.portal.Error.Failed: Could not get window list: GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: App introspection not allowed

On the same machine i used 18.04 where it was working fine