Thanks @nim65s, we are now able to run python -c "import eigenpy" after installing python-is-python3 but nothing changes into the running part of the demo_solo12.py.
Thanks again for now.
Andrea
Hum… I can’t reproduce that, and the message is clearly not explicit enough. Are you sure everything is up to date (apt binary packages / git clones) ?
Maybe we can try adding a import eigenpy in demo_solo12.py on line 10, just before this failing import, and see if this help