Debian/Ubuntu requirement: python3-venv

[Juan Marinero]

TLDR:

• vim-plug might show as successful a wrong installation #1806
• Debian/Ubuntu OS require python3-venv. This is NOT enough: $ apt-get install python-virtualenv (neither Anaconda, I guess)

My experience. I hope it helps someone. I am newbie, so my advises might be all wrong, if so just delete issue.

After pip install -U jedi-language-server,

• I failed with
  Plug 'pappasam/coc-jedi', { 'do': 'yarn install --frozen-lockfile && yarn build' }
  vim-plug's :PlugInstall seems to accept a full of warnings the engine "coc" appears to be invalid
  but actually, as soon as open a py file I saw the error:
  [coc.nvim] jedi: Error: Command failed: python3 -m venv /.vim/plugged/coc-jedi/.venv && /.vim/plugged/coc-jedi/.venv/bin/pip install -U jedi-language-server==0.23.1
  Posible soltuion #1806 and install python3-venv. Idk, did no try further this way.

• I succeeded with
  1st comment the Plug line in ~/.vimrc and :PlugClean
  Then I ran :CocInstall coc-jedi but in py files did error:
  [coc.nvim] jedi: Error: Command failed: python3 -m venv /home/[$USER]/.config/coc/extensions/node_modules/coc-jedi/.venv && /home/[$USER]/.config/coc/extensions/node_modules/coc-jedi/.venv/bin/pip install -U jedi-language-server==0.23.1
  Also, I tried in terminal (outside VIM):

$ python3 -m venv $HOME/.config/coc/extensions/node_modules/coc-jedi/.venv
The virtual environment was not created successfully because ensurepip is not
available.  On Debian/Ubuntu systems, you need to install the python3-venv
package using the following command.
    apt-get install python3-venv

As suggested, I just did installed python3-venv and ran the :CocInstall command again. Happy ending!