/usr/share/gdm/default.pa is in gdm3 3.28.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | #!/usr/bin/pulseaudio -nF
#
# Work around for PA not allowing access to A2DP profiles in the user session
# because GDM already has it open.
# LP: #1703415
# load system wide configuration
.include /etc/pulse/default.pa
### unload driver modules for Bluetooth hardware
.ifexists module-bluetooth-policy.so
unload-module module-bluetooth-policy
.endif
.ifexists module-bluetooth-discover.so
unload-module module-bluetooth-discover
.endif
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