Could not find a version that satisfies the requirement

Question

I\'m installing several Python packages in Ubuntu 12.04 using the following requirements.txt file:

numpy>=1.8.2,<2.0.0
matplotlib>=1.3.         


        

Answer 1

I had installed python3 but my python in /usr/bin/python was still the old 2.7 version

This worked ( was pyserial in my case):

python3 -m pip install