pip, anyone?

So I am finally getting around to upgrading my pgadmin4, and I was a little
confused about the 'best' way to install or upgrade. The answer to this
question may be out there, but I didn't see it.

I checked pypi, and a search for pgadmin4 came up empty. But I have seen
blogs and tutorials (out of date?) make reference to doing a pip install.
And yet, on postgresql.org, my search led me to downloading a wheel (which,
if memory serves, is how I got my current version) with no reference to pip
install. But then how did I get all the dependencies? Are they in the
wheel, too?

There is also, apparently, apt-get (I'm on Ubuntu 18.04 with Postgresql
11.2).

If there is a simple but up to date explanation of all this out there, feel
free to just link to it in your response instead of writing out the answer
here. Thanks.

*“None of you has faith until he loves for his brother or his neighbor what
he loves for himself.”*