It might be as simple as
sudo ln -s /usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0 /usr/lib/libpython3.4m.so.1.0
However, I'm on Debian Testing, and it uses Python 3.6
So, you might need to locate your specific libpython3 just to be sure.
sudo apt-get install mlocate && updatedb
locate libpython3.
In my case, I used:
sudo ln -s /usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0 /usr/lib/libpython3.4m.so.1.0
If this doesn't solve it, you can look here for more info. https://github.com/Gigoteur/PX8/issues/65