Upgrading python3.4 to python3.6 on ubuntu breaks pip

Question

I\'m attempting to install python3.6 on my machine after I currently have python3.4. However, after installation trying to run pip under python3.6 gives me the

Answer 1

I replaced Python 3.4 with 3.6 on my Ubuntu 14.04 servers and I had the same problem. In my case the cause seemed to be an ancient system pip:

$ pip --version
pip 1.5.4 from /usr/lib/python2.7/dist-packages (python 2.7)

I have never installed python3-pip. Instead I solved the error as follows:

$ sudo pip install --upgrade pip
$ sudo pip install --upgrade virtualenv