elpy: autocompletition not working

[c.buhtz]

Hi,

I setup my elpy on Debian 10 via this blog-post.
https://realpython.com/emacs-the-best-python-editor/#emacs-for-python-development-with-elpy

Auto-completion do not work; means do not pop up.

Regarding to my experience with a flycheck related problem in the past
I would assume that there is a extern commandline tool or python
package on my system missing.

But I do not know how to "ask" elpy about what is missing. I do not
know what elpy use for auto-completion.

I also checked the (official?) docs here:
https://elpy.readthedocs.io/en/latest/ide.html#completion

btw: What does "M-TAB (elpy-company-backend)" means?
In my understand "M-" on a usual IBM-PC-Keyboard is the ALT-key on the
right beside the Windows-key.

But ALT + TAB does window switching (on Windows and Linux-XFCE).

The IRC channel is dead by bots.