Dear maintainer,

after installing iperf3, where I answered that I don't want it to run as
a service, I got an error in the apt output:

    Failed to stop iperf3.service: Unit iperf3.service not loaded.

It seems to me that an attempt to stop the service has been made,
although none was running, neither existing. If I am interpreting it
correctly, I should not get such an error message when it is not
actually an error – maybe a check whether the service exists should
be made beforehand, in this case?

Best wishes
Tomaxuser