The Arch wiki mentions this problem and only suggests disabling the gdm pulse instance :P
https://wiki.archlinux.org/index.php/Bluetooth_headset#Connecting_works.2C_but_I_cannot_play_sound -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gdm3 in Ubuntu. https://bugs.launchpad.net/bugs/1703415 Title: Disable Bluetooth sink in GDM to allow A2DP in the user session To manage notifications about this bug go to: https://bugs.launchpad.net/pulseaudio/+bug/1703415/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs