Getting vimux to work on Ubuntu 13.10

Question

The error message when running

:h vimux is

E149: Sorry, no help for vimux.

It seem that vimux is not working at all.

Am I missing something really basic?

• I installed vimux by cloning the https://github.com/benmills/vimux.git repository from github to ~/.vim/bundle where a vimux directory was established.
• I run Ubuntu 13.10 and try to use vimux from gvim. (In any case, the same error persists when using vim from the terminal)

I have been googling this for some hours now and am really stuck.

Answer 1

Vimux cannot be run from an ordinary (g)vim session. Instead, vim must be started from within tmux. Then, vimux works flawlessly. Thanks @Ingo_Karkat for guiding me towards the solution.