/usr/lib/systemd/user/xubuntu-session.target is in xubuntu-default-settings 18.04.6.
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 | [Unit]
Description=User systemd services for Xfce graphical session
# start/tear down graphical-session.target along with the Xfce session
BindsTo=graphical-session.target
# session leader -- if this dies, die along with it
BindsTo=xfce4-session.service
|