Hello,

Running on Fedora 43 with latest updates.  I created a systemd user service
that is globally enabled (ie, sudo systemctl --global enable
servicename.service) and configured to launch when any user logs in to the
system (hopefully, only for graphical logins):
---
[Unit]
Description=Registration Reminder
After=graphical-session.target
PartOf=graphical-session.target
After=polkit.service

[Service]
Type=forking
ExecStart=/usr/share/Project/wrapperscript
Restart=no

[Install]
WantedBy=default.target
---
(I've modified some of the details since they are internal.)

The wrapperscript launches a python gtk dialog with pkexec that requires a
user to do some stuff and configures their system.  After a reboot, the
service always fails to start the first time it is started. Sometimes, the
attempt to initialize the pygtk env cores with "Can't create a
GtkStyleContext without a display connection."

After debugging this, I realized that systemd was trying to start this
service for the gdm user.  (I guess the display environment that systemd
starts for gdm doesn't stick around for too long, which is why sometimes it
cores.)

I don't want this service to run for the gdm user, and Google suggested
this command:

sudo systemctl --user -M gdm@ disable servicename.service

Checked the systemd manpage, and it seems legit. However, whenever I try
and run this command, it always fails:

sudo systemctl --user -M gdm@ disable servicename.service
Failed to connect to system scope bus via local transport: No such file or
directory
Failed to disable unit: Transport endpoint is not connected

There is no /run/user/42/bus path for gdm like I have for my regular user.

Anyone know how to disable a globally enabled systemd user service for gdm?

Thanks,
Ben
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