Re: Query about command line commands

[Andrei Borzenkov]

В Tue, 10 Mar 2015 16:28:09 +0800
Bret Busby <address@hidden> пишет:

> 
> So, now, the question arises; given that the system is a UEFI/GPT
> system, with an EFI bootloader (?) that is not accessed, that points
> to MS Windows 8, and, using an apparently BIOS-based bootloader (the
> once again, operational GRUB) that points to Ubuntu Linux and Debian
> Linux, how to I get a bootloader to point to all three of those
> operating systems, so that the same bootloader, allows me to select
> any one of those three operating systems, to load and run?
> 
> Does GRUB provide for that?
>

Yes. GRUB can be built for UEFI and most distributions I'm aware of
ship multiple GRUB flavors for different platforms. How exactly
packages are named depends on distribution, you are better ask there. I
expect GRUB for EFI be named something like grub2-x86_64-efi or
similar. All of them can be installed in parallel on the same system
and be able to boot using both BIOS and EFI using the same grub.cfg.

The catch22 is, that you cannot configure EFI firmware to use it unless
you have already booted in EFI mode. And how to do it is rather system
dependent. The first question here would be why all your Linux
installations were done in legacy BIOS mode.