I thank you both for your advices.
But what i did exactly is:
- Tried installing using the DEB package
- Tried installing using the TGZ package. In this case, I tried installing in my home folder AND in the /opt/xojo/ folder.
Both solution failed. Xojo starts correctly, and everything seems to be working correctly, until I try to move the cursor in the code editor USING THE ARROW KEYS. At this moment, XOJO simply closes, without any advice.
As I said, I tried installing on a virtual machine (VirtualBox) running Linux Mint 19.3, and another running Linux Mint 20. Both are running without any problem. I though it has something to deal with the fact I was running Cinnamon. I tried switching to MATE, with same result. I think the problem is linked with some driver, because they are obviously different for a virtual machine and and a physical one.
Because using a virtual machine is not really a problem, I probably will go on with that solution.
Thanks anyway for trying to help me. I really appreciate.