grub-pc versus grub-efi-amd64

[Volker Wysk]

Hi!

I've completely reinstalled and set up my UEFI system anew, a few weeks
ago. Now I'm wondering why the package grub-pc and not grub-efi-amd64
is installed. I have two GPTs (SSD and HDD) and a partition which is
larger than 2 GB on the HDD, and it works.

On the page [1] there it's written about the GRUB customizer program:

"Dieser Artikel basiert auf dem Paket grub-pc für ältere BIOS-Rechner
bzw. Installationen im BIOS-Modus. Auf modernen EFI-Systemen wird
dagegen das Paket grub-efi-amd64 eingesetzt. Während das bei einfachen
Aufgaben keine Rolle spielt, kann ein Neuschreiben des MBR (BIOS-Modus) 
ein EFI-System schwer beschädigen!"

I couldn't find an English version. Here's my translation:

"This article is based on the package grub-pc for elder BIOS-computers
or rather installation in BIOS mode. On modern EFI systems however the
package grub-evi-amd64 is used. Whereas this doesn't play a role for
simple tasks, a new-writing of the MBR (BIOS mode) can damage an EFI-
system severely."

Why is grub-pc installed on my system, and not grub-efi-amd64? Why does
it work at all..??

What happends when I run Grub Installer? Will that nuke my new system?
What happends when I install grub-efi-amd64?

Bye,
Volker

[1] https://wiki.ubuntuusers.de/GRUB_Customizer/

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