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
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