Hi Francesco and Federico,
Looking on your screenshot and your error messages, it seems that you have a
problem when you launch nav_view node.
Nav_view node, as rviz, use ogre libraries that should required graphical
card driver set up properly.
Please check if everything in your ubuntu installation is fine. I never
tried, but if I don't make a mistake, you are running ubuntu on virtual
machine; maybe this could cause your errors; check if your video card
setting are ok.

Regards,
Enea Scioni
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