Am 07.05.21 um 02:12 schrieb Michael Biebl:
exim4 is unfortunately still SysV-only and doesn't ship a native systemd .service file. So the correct command is"update-rc.d exim4 disable"
For the curious: you can run "systemctl disable exim4" as well. This will just run the above command though via /lib/systemd/systemd-sysv-installIt's a thin wrapper to make systemctl more convenient to use and you don't need to remember whether a service has a native .service unit file or still ships only a legacy SysV init script.
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