What could cause the `net_adm` kernel Erlang module to be unavailable?

Question

Installed Erlang (releases from 19 to 22) using

• the Nix package manager
• apt
• and compiling from source

on Ubu

Answer 1

Kind of ashamed to admit that I am an idiot, but net_adm was there all this time...

For some reason, it wouldn't autocomplete on the erl shell, but once typed out starting with net_adm: (such as the non-existent net_adm:ping()), and executed it, it would start recognizing the module, and provide a list of available functions when hitting the Tab key.