I have some applications that are launched by systemd -user. These are the applications that I want to exit cleanly on every reboot or when exiting X.

google-chrome is one of them.

In my [Service] section, I have:

KillMode=process

But whenever I use 'systemctl --user stop chrome' or 'systemctl --user default', on relaunch, chrome would complain about not being shutdown correctly.. I fixed this by adding KillSignal=SIGTERM in addition to KillMode. Odd that I had to add that since the Man page told me that KillSignal already defaults to SIGTERM.