On 04/05/2023 at 16:21, Peter Ehlert wrote:
"Install the GRUB boot loader" menu ... 6 items
Enter device manually
/dev/sda (usb-SanDisk ...
/dev/sdb (ata-WL4000G ...
/dev/sdc (ata-WDC_WD300...
/dev/sdd (ata-WDC_WD300...
/dev/sde (ata-SanDisk_SDSSDA240G_162248447811)
I selected /dev/sde and pressed the Continue button
then the GUI progress bar Installing GRUB and I see Running
"grub-install /dev/sdd" ...
in this case sdd was the install location, sde is the drive that has a
bios_grub flagged partition
OK, I think I managed to reproduce the issue and it shares the root
cause with another bug I am currently chasing (GRUB is not installed at
all). Some logic in grub-installer seems to be flawed but I still need
to understand the original intent before I can submit a patch for both bugs.
Meanwhile, a workaround is to enter the boot device manually.
setting up BIOS to boot from a drive that does not have a bios_grub
flagged partition results in:
"GPT-formatted disk.
Legacy boot not supported. Press any key to reboot."
If this is a message from the BIOS, then it is flawed. A compliant
BIOS should not care about the partition table, even less the presence
of any kind of partition. All a BIOS should care about is the presence
of the "boot signature" 0x55, 0xAA at the end of the boot sector.
Yes, that is from the BIOS
(...)
root@z820-3:~# grub-install /dev/sda && update-grub
Installing for i386-pc platform.
grub-install: warning: this GPT partition label contains no BIOS Boot
Partition; embedding won't be possible.
grub-install: error: embedding is not possible, but this is required for
cross-disk install.
This failure has nothing to do with the above. You are trying to install
GRUB on a GPT disk which is not the one containing /boot ("cross-disk"),
and this requires a BIOS boot partition.
