/usr/lib/systemd/user/pulseaudio.socket is in pulseaudio 1:11.1-1ubuntu7.
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 | [Unit]
Description=Sound System
[Socket]
Priority=6
Backlog=5
ListenStream=%t/pulse/native
[Install]
WantedBy=sockets.target
|