Need help with changing Python interpreter.

Hi,

I'm new to PyCharm and I'm using the latest version.

I installed Python 3.6 globally and navigated to the project interpreter page.

I selected Python 3.6 and after clicking on Apply I was presented with a page asking me to install packages.

Some are shown alongside the latest version.

What happens if I click Apply?

Will the global packages be updated?

Also at the bottom of the page I get:

python packaging tools not found. Install packaging tools.

I don't understand what the above line means.

I thought that just selecting the interpreter would be enough.

Thanks in advance for any help.

Ubuntu 16.04.

PyCharm 2018.1.4