IGL installation

[tomfrankkirk]

Had a really hard time getting this to install on the IBME VM alongside tf. I think its related to an old libc++6 library. The error message I was getting in python was
/usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.22' not found (required by /home/ibmeuser/anaconda3/envs/svb/lib/python3.7/site-packages/igl/pyigl.cpython-37m-x86_64-linux-gnu.so)

I fixed it using this. The trick seems to be forcing apt-get to refresh the list of latest available packages to download the newer versions of the library. Normal apt-get update commands didn't do it, I had to add the extra commands in the answer.

https://askubuntu.com/questions/575505/glibcxx-3-4-20-not-found-how-to-fix-this-error

[tomfrankkirk]

PS this isn't so much an issue, I just wanted to write this down for future reference!