Took a little bit but managed to make it run.
Steps:
1.
Download the Linux version
2. If you don't have it, install
Java Runtime (from Add/Remove Applications)
3. Go to
System / Synaptic Package Manager, search for the
libstdc++5 package and install it.
4.
Unpack the .tgz that you just downloaded and execute the file 'processing'.
5.
Enjoy.
With these packages installed shouldn't give any errors.
If Compiz is the composite manager on gnome, the screen crashes slowly when I run a sketch. Only if I disable compiz and -not necesseraly- set metacity to be the composite manager.
And ideas why could this happen?
I am having a Nvidia card with latest driver from repository.