Grub 2.12 installation

[rektal]

How to update from grub 2.06 to 2.12?
I have info that I do not choose install grub?

After that I have to use Timeshift to boot to reverse changes and boot up.
I can't handle it.

[rektal]

I use [tab] to switch between option and use [spacebar] to select my disk.
But after that I can't boot up to my system.

I have to blocked grub-pc packages on version 2.06. And it works.