Help installing latest version of Unity on Ubuntu 18.04

I’ve just switched to Ubuntu from Windows (just installed it yesterday). I’m still getting up to speed with the new OS and I’m having a lot of trouble figuring out how to install the Unity Editor. I’ve seen a lot of conflicting instructions, many of which seem to be out of date.
I downloaded some sort of “official installer” from the forum (UnitySetup-2018.1.0f2), but I don’t know what to do with it. If I click it, I get a message that says “There is no application installed for executable files.” Can someone explain, step-by-step, how to get this thing installed. I’m a very tech-savy person, but I’ve used Windows my entire life and Linux is new territory for me. Thanks for the help!

You probably need to give it executable permission in your file manager.

Go to the folder where you have the downloaded installer.
Then right click on an empty space in that folder and select “open in terminal”.

In the terminal window enter
chmod +x UnitySetup-2018.1.0f2
to make the file executable.

After that enter
./UnitySetup-2018.1.0f2
to run the installer.

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