Help required! The Ubuntu Linux version just doesn't work!

Above.

I’ve tried to do the 3D Platformer project about 3 times and it just doesn’t work.

I’m using last year’s version on Ubuntu Linux, a supported OS! HELP!

I’ve imported the package file for the project and it gave the above errors.

I think the Package files are out of date.

The above image is from an intro to Unity course I started last night from Zenva.com.

Make with the help please.

Have you already followed this instruction?

Yes, I installed an updated version of the Hub last night.

And the projects still don’t work.

Unity 2020.3, on Ubuntu Linux, allegedly a supported OS.