The real problem is python-ply. It is buggy.
The bug may be solved by installation of previous version to the home
folder with pip:
sudo apt-get install python-pip
pip install ply==3.4 --user
** Also affects: ply (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1629672
Title:
glpk module import fails
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