How to fix systemd error: Failed to determine user credentials: No such process
Problem
You have a systemd service such as
[Unit]
Description=My Service
[Service]
ExecStart=/usr/bin/my-service
User=myuser
[Install]
WantedBy=multi-user.target
but in the log (systemctl status my-service) you see the following error:
Jun 19 18:41:36 mycomputer (nice)[1349797]: my-service.service: Failed to determine user credentials: No such process
Jun 19 18:41:36 mycomputer systemd[1]: my-service.service: Main process exited, code=exited, status=217/USER
Solution
The reason for this is quite simple: The user you specified in the User= directive does not exist on your system.
Check the user for spelling mistakes and verify it actually exists on the computer running the service.
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