Ubuntu 20.04 Nvidia Prime?

I installed Ubuntu 20.04 for test it and I found that I can't use the "Nvidia on-demand" option of Nvidia X Server Panel. Actually, I can't choose any option of Nvidia Prime because it doesn't appear in the Control Panel of Nvidia. It's visible on Ubuntu 19.10 but not here.

I tried to set it on terminal the "prime-select" command (I have installed nvidia-prime) but it doesn't work. Actually I can't start my session or launch it, I'm blocked on the gdm.

Could it be 'cause of Nvidia himself?

    Processor: Intel i7 8xxx
    Graphic card: Nvidia GTX 1060
    Graphic server: Xorg

Thanks!

https://i.stack.imgur.com/z4Tje.png

https://i.stack.imgur.com/4KJET.png