Where is virtualenvwrapper.sh?

From /usr/share/doc/virtualenvwrapper/README.Debian:

In contrast to the information in
/usr/share/doc/virtualenvwrapper/en/html/index.html this package installs
virtualenvwrapper.sh as /etc/bash_completion.d/virtualenvwrapper.

Virtualenvwrapper is enabled if you install the package bash-completion and
enable bash completion support in /etc/bash.bashrc or your ~/.bashrc.

If you only want to use virtualenvwrapper you may just add

 source /etc/bash_completion.d/virtualenvwrapper

to your ~/.bashrc.

Yes, it's a bit hard to find :D

On Ubuntu

The script's location is:

/usr/share/virtualenvwrapper/virtualenvwrapper.sh

So if you've installed virtualenvwrapper with the package manager, you must add the following lines into your ~/.bashrc:

export WORKON_HOME=~/.virtualenvs
source /usr/share/virtualenvwrapper/virtualenvwrapper.sh

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Also, remember to reload your ~/.bashrc with:

$ source ~/.bashrc

If everything worked well, then you'll be able to run mkvirtualenv like:

mkvirtualenv --python="/usr/bin/python3" venv_name