Some rules addition for gnome support.

apparmor.d/groups/desktop/at-spi-bus-launcher

@@ -1,5 +1,6 @@
 # apparmor.d - Full set of apparmor profiles
 # Copyright (C) 2018-2021 Mikhail Morfikov
+#               2021 Alexandre Pujol <alexandre@pujol.io>
 # SPDX-License-Identifier: GPL-2.0-only
 
 abi <abi/3.0>,
@@ -26,20 +27,27 @@ profile at-spi-bus-launcher @{exec_path} {
   /{usr/,}bin/dbus-daemon rPUx,
 
   owner @{PROC}/@{pid}/fd/ r,
+  owner @{PROC}/@{pid}/cgroup r,
 
   owner @{HOME}/.Xauthority r,
   /var/lib/lightdm/.Xauthority r,
+  @{run}/user/[0-9]*/gdm/Xauthority r,
 
   /usr/share/glib-2.0/schemas/gschemas.compiled r,
 
   include <abstractions/dconf>
   owner @{run}/user/[0-9]*/dconf/ rw,
   owner @{run}/user/[0-9]*/dconf/user rw,
+  /usr/share/dconf/profile/gdm r,
+  /var/lib/gdm/.config/dconf/user r,
 
   # file_inherit
   owner /dev/tty[0-9]* rw,
   owner @{HOME}/.xsession-errors w,
   /var/log/lightdm/seat[0-9]*-greeter.log w,
+  /usr/share/gdm/greeter-dconf-defaults r,
+
+  @{PROC}/1/cgroup r,
 
   include if exists <local/at-spi-bus-launcher>
 }