Contom

Many thanks !!!

It was exactly  a SOLUTION.

[0.000000] RDRAND gives funky smelling output, might consider not using it by booting with "nordrand"

I have almost same line to that one (different number at start) at every start of PC.
After i installed new BIOS version and
did clean install of minecraft-launcher (with --purge and removing .minecraft folder)
it was fixed.

I guess now i have HW random generator active too :3
Many thanks once more.

After fresh restart and clean install it created .minecraft folder.
Here is the video: https://youtu.be/i6Coxud8n2A
I found some log files in .minecraft and one of them has an error near the end. I am attaching it too.

No, i don't know how to install arch files on my Ubuntu.

As soon as i get home from job i will record it.

I had tried official launcher in my old ubuntu version, before i did upgrade.

But it was failing, too, however it was probably different error than current one, because instead of  liltle window freeze it got stuck in processes (i didn't reported it, because i tried unofficial launcher that worked GD )

I had that .minecraft folder, but i did uinstaled launcher and removed it as one attempt to make it work (didn't helped) . I specificaly checked, if it is recreated, but it was not.