Unbreak Debian 11 and partially Ubuntu 22.04 (Wayland+GDM+Gnome) (#81)

* Unbreaking Debian 11 and partially Ubuntu 22.04

* pre-cleanup

* pre-cleanup2

* Update im-launch

* Update gnome-extension-ding

* polishing

* not yet

* Update ubuntu.flags

Allow GDM to boot. `No new privs` fix.

* Update debian.flags

Allow GDM to boot. `No new privs` fix.

* Update CONTRIBUTING.md

* fixes

* reverting w

* move setpriv to main.flags

apparmor.d/groups/freedesktop/dconf

@@ -12,13 +12,19 @@ profile dconf @{exec_path} flags=(attach_disconnected) {
   include <abstractions/dconf-write>
 
   capability sys_nice,
+  capability dac_override,
 
   @{exec_path} mr,
 
   /etc/dconf/db/** rw,
 
+  /usr/share/gdm/dconf/{,**} r,
+
+  /var/lib/gdm{3,}/ r,
+  /var/lib/gdm{3,}/greeter-dconf-defaults{,.??????} rw,
+
   owner @{user_config_dirs}/dconf/ rw,
   owner @{user_config_dirs}/dconf/user{,.*} rw,
 
   include if exists <local/dconf>
-}
+}