After installing gnome-shell and gnome-shell-common again and being presented with the blank screen after reboot I found some errors in the user.log, see attached text file.
Hope this helps ... -- Regards Marc
Aug 9 18:41:46 debian gdm-Xorg-:0[1226]: > Warning: Compat map for group 3 redefined Aug 9 18:41:46 debian gdm-Xorg-:0[1226]: > Using new definition Aug 9 18:41:46 debian gdm-Xorg-:0[1226]: > Warning: Compat map for group 4 redefined Aug 9 18:41:46 debian gdm-Xorg-:0[1226]: > Using new definition Aug 9 18:41:46 debian gdm-Xorg-:0[1226]: Errors from xkbcomp are not fatal to the X server Aug 9 18:41:46 debian gdm-Xorg-:0[1226]: resize called 1920 1200 Aug 9 18:41:46 debian gnome-session[1286]: gnome-shell: symbol lookup error: /usr/lib/gnome-shell/libgnome-shell.so: undefined symbol: meta_is_wayland_compositor Aug 9 18:41:47 debian gnome-session[1286]: (gnome-settings-daemon:1427): GLib-GIO-CRITICAL **: g_dbus_proxy_call_internal: assertion 'G_IS_DBUS_PROXY (proxy)' failed Aug 9 18:44:01 debian gdm-Xorg-:0[1226]: (II) AIGLX: Suspending AIGLX clients for VT switch Aug 9 18:44:01 debian gdm-Xorg-:0[1226]: (II) NOUVEAU(0): NVLeaveVT is called.
