On 13/9/23 15:15, Andrei Borzenkov wrote:
On Wed, Sep 13, 2023 at 9:53 AM Goh Lip <[email protected]> wrote:
You cannot
mix efi and legacy install in the same disk
You most certainly can as long as you have some way to select the boot
method. You cannot use the same partition both as ESP and BIOS_grub,
that's true.
For more than ten years, I had Ubuntu Linux installed on a HDD with MS
Windows 8; Windows 8 used UEFI, and when I originally installed Ubuntu
Linux (after Debian Linux, which coexisted on the computer, for a number
of years) - I had three versions of Ubuntu Linux installed, at one
stage, it was installed using (as Ubuntu 12.04 only allowed installation
using) Legacy BIOS.
From what I understand, Ubuntu Linux has been able to be installed (at
least, up until 22.04) using Legacy BIOS, although, a time came, when
Ubuntu Linux (and, Linux Mint does it) installs by default, via UEFI.
When Legacy BIOS is used for installing Linux, it was done by entering
the BIOS, switching off the malignant Secure Boot, and, choosing Legacy
BIOS over UEFI, in the BIOS options.
Then, when Linux versions were installed, using Legacy BIOS, the GRUB
boot options listed the Linux variant options, into which, to boot
directly, and, the Windows Bootloader option.
This was all, on each of my computers, on a single hard drive (in each
computer) upon which operating systems were installed; the primary HDD
(for each computer).
I have not installed operating systems across more than one HDD (I use
HDD, for what is/was regarded as a "hard drive" - on my latest computer,
the primary "hard drive" storage (I can't remember the proper term for
the static storage, that is not RAM or BIOS - it is too many years since
I did computer hardware courses, for me to remember all of the
terminology), is an NVVME (?) thingy - an SSD thingy, that is on a
computer card that goes in a slot, and, whilst the computer does have a
hard disk drive, it is not the primary "hard drive").
But, I have been installing operating systems, using Legacy BIOS, on
computers that have had MS Windows 8 and later (MS Windows 8, from
memory, was the first MS Windows version, to use UEFI and, the malignant
"Secure Boot"), and, so, installing using legacy BIOS, on systems that
had default UEFI booting, for more than ten years, now.
So, Legacy BIOS can be used to install operating systems, on the same
"hard drive", that has a UEFI installed operating system, and, that has
an EFI partition.
That is, on computers that have Legacy BIOS available.
With the destruction of computing, that has been caused by computer
manufacturers, it is difficult to know whether Legacy BIOS is available
on new computers (that have been deliberately made only partially
functional, by the computer manufacturers, which is why it is no longer
a good idea, to buy a new computer - more functional computers than new
computers, can be found at rubbish tips).
..
Bret Busby
Armadale
West Australia
(UTC+0800)
..............
