How to list user services of another user under ubuntu

Question

There is the usual command for listing the systemd services:

systemctl list-units --type=service

Then there is the --user parameter for enabling and starting a user service, executing the command from a user's session:

systemctl --user enable/start <service name>

I need, as root, to list services running under a certain user, something like:

systemctl list-units --type=service --user <username>

Haven't been able to find anything about this. Is it even possible?

Answer 1

Yes, it is, but by using sudo. Read man sudo sudoers, and

sudo -u theuser systemctl ...

will do the trick.