Suggestion: Error handling - check and say that traceroute is not installed

[VjeraTurk]

Suggestion to add explicit error message if the environment doesn't have traceroute installed.
Currently, the system fails with a more generic error message:

"spawn traceroute ENOENT"

I would appreciate a nicer message, perhaps letting you know you should install the traceroute.

Of course, this should be obvious, but still, one can forget to install it in a docker image. In such cases, knowing right away what the problem is without putting in effort would save some time and nerves.

Steps to reproduce:

Run the example code without traceroute installed on your machine.