Issues on a fresh install of 20.04

[zenakuten]

I've tried a few times to install on a fresh installation of ubuntu 20.04. Here's what I've found:

1. need to install python2 and pip2 first before anything else
2. need to set git credentials (user.name, user.email) or install-dependencies fails.

Once built, trying to run an example with e.g. openrave.py --example fails due to missing opengl.
need to pip2 install pyopengl

Sadly, it seems openrave on 20.04 has numerous issues. 'openrave.py --example hanoi' crashes with 'missing .radius' property. It seems there are many failures in pybind11 causing crashes. The examples seems to work OK on 18.04, but only a handful run on 20.04 without crashing.