Don't tell users to pip install vorta

[ktosiek]

Is your feature request related to a problem? Please describe.
Current documentation for installing Vorta on Linux suggests running pip3 install vorta, which might cause problem with user's system Python installation (if it even succeeds, but users are used to slapping sudo in front of failing commands :-)).

Describe the solution you'd like
The documentation should suggest a safer installation method. I've tested installing with pipx on Ubuntu 20.04, with pipx installed from the repository, and it works well.

[Hofer-Julian]

I'd be fine with that.

@m3nu ?

[m3nu]

Users who use pip generally know how to maintain their Python env. E.g. on macOS you would use Homebrew Python, which is different from system Python. (not sure there is even a system Python these days)

On most project pages, I usually see just pip install ... Users will know themselves whether they want to use a specific env or the --user option.

I'm OK to add a very short note on using a venv or --user option, but wouldn't link to a specific pip replacement as there are too many. There was a big controversy about pipenv some time ago, when they oversold themselves as "the standard way", which isn't the case.

[m3nu]

PS: The docs for Vorta are in this Github repo: https://github.com/borgbase/vorta.borgbase.com

[ktosiek]

Would it make sense to describe steps to create a venv, install vorta there, and link $venv/bin/vorta to ~/.local/bin/? That's pretty much what tools like pipsi or pipx do, and should be a nice and safe installation method.

pipx is not really a pip replacement, and it's not a development tool like pipenv. It is meant for installing Python applications, that's why I've suggested it.

Developers who use pip generally know how to use it, and when/how to use venvs. Here I'm concerned about users who are not Python developers, and don't have to know how pip works - they just want to install Vorta. #565 is an example of this - the first install method caused problems, so the user tried the next one.