Bug#805414: gdm3: disable pulseaudio to prevent capturing A2DP sink on session start

[Aurelien Jacobs]

Package: gdm3
Version: 3.22.3-3
Followup-For: Bug #805414

The workaround from https://wiki.debian.org/BluetoothUser/a2dp used to
work, but starting with gdm3 3.22.3-2, it is not enough anymore.
I found out that I now need the following additional step to really
prevent gdm3 to start pulseaudio:

rm /var/lib/gdm3/.config/systemd/user/sockets.target.wants/pulseaudio.socket

This, along with the /var/lib/gdm3/.config/pulse/client.conf file, got
my bluetooth headset working again.