> A pitfall to take in mind: it's the ‘essential-services’ field
> you need to modify, not the ‘services’ field of ‘operating-system’.
> My original example at [1] was incorrect.  A corrected example:
>
> (operating-system
>  [...]
>  (services [don't modify this])
>  (essential-services
>   (modify-services (operating-system-default-essential-services
>                     this-operating-system)
>     (shepherd-root-service-type c =>
>                                 (shepherd-configuration
>                                  (inherit c)
>                                  (shepherd-patched))))))