I'm desperately unsuccessful installing 1.8.13

I'm on a linux machine and I tried to update my Arduino IDE to 1.8.13.

It has been previously installed with APT. I've done many try but still unsuccesful...

Isn't there a detailed tutorial to properly uninstall Arduino IDE , then install it again ?

Start here

By now, after running "sudo ./install.sh " the shortcuts appear but Arduino doesn't open !