Since ages my Arch Linux system won't shutdown quickly because systemd is waiting for a stop job of User Manager for UID 1000 (which is my user).

In https://github.com/systemd/systemd/issues/1615#issuecomment-351433148 I was told that I could find out the faulty process which doesn't properly terminate using systemd-cgls, and that's what I got:

│ └─user-1000.slice
│   └─user@1000.service
│     ├─init.scope
│     │ ├─2140 /usr/lib/systemd/systemd --user
│     │ └─2141 (sd-pam)
│     └─tracker-store.service
│       └─2471 /usr/lib/tracker/tracker-store

So it seems like the tracker-store process won't terminate and systemd is waiting two minutes before it kills it to complete the shutdown procedure.

I have this problem only on my Arch Laptop (constantly, for at least half a year).  On my Arch workstation (which does have the very same versions of GNOME, tracker, etc.), the problem never occurred.

My current tracker version is 2.0.3 with GNOME 3.26 and systemd 237.64.