How To Configure PackageKit Services

With default settings packagekit.service gets invoked for every graphical login hourly. With the following modification of unit files packagekit runs in the backgroud and sends email notification:

erlangen:~ # systemctl list-unit-files packagekit*
UNIT FILE                         STATE  
packagekit-background.service     static 
packagekit-offline-update.service masked 
packagekit.service                masked 
packagekit-background.timer       enabled

4 unit files listed.
erlangen:~ # 

You need to mask unwanted services and enable packagekit-background.timer:

erlangen:~ # systemctl list-timers packagekit-background.timer
NEXT                          LEFT     LAST                          PASSED UNIT                        ACTIVATES
Fri 2019-08-23 00:00:00 CEST  15h left Thu 2019-08-22 02:51:39 CEST  6h ago packagekit-background.timer packagekit-background.service

1 timers listed.
Pass --all to see loaded but inactive timers, too.
erlangen:~ # 

Check for proper operation:

erlangen:~ # journalctl -b -u packagekit-background.service
-- Logs begin at Wed 2019-07-31 16:03:01 CEST, end at Thu 2019-08-22 08:54:47 CEST. --
Aug 22 02:51:39 erlangen systemd[1]: Started Script to update the system with PackageKit.
Aug 22 02:51:40 erlangen systemd[1]: packagekit-background.service: Succeeded.
erlangen:~ # 

Edit units by running ‘systemctl edit packagekit-background.timer’ and ‘systemctl edit packagekit-background.service’. Drop-in directories will be created automatically:

erlangen:~ # systemctl cat packagekit-background.timer packagekit-background.service
# /usr/lib/systemd/system/packagekit-background.timer
Description=Systemd timer to update the system daily with PackageKit



# /usr/lib/systemd/system/packagekit-background.service
Description=Script to update the system with PackageKit


# /etc/systemd/system/packagekit-background.service.d/override.conf
** KillMode=process**
erlangen:~ # 

The above configuration invokes packagekit daily. The timer is default. The service needs editing of KillMode.