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Re: grub-install problem after trixie upgrade



Hi,

On Mon, Aug 11, 2025 at 01:36:03AM +0100, Alain D D Williams wrote:
> The main disk is 2 disks in a RAID-1 pair (mirroring). The boot partition is
> /dev/md0 that is built thus:
> 
> md0 : active raid1 sda1[0] sdb1[1]
>       510976 blocks super 1.2 [2/2] [UU]
> 
> I get an error installing grub. I do not understand it let alone know how to
> fix it. Note that the error happens for sda but not sdb:
> 
> 	# grub-install --target=i386-pc  /dev/sda
> 	Installing for i386-pc platform.
> 	grub-install: warning: You have a short MBR gap and use advanced config. Please increase post-MBR gap..

I suspect you have too few sectors between the beginning of the disk and
the start of sda1 for grub to fit its core.img in. Please show us the
output of:

# fdisk -u -l /dev/sda
# fdisk -u -l /dev/sdb

(both harmless / read-only)

It is recommended to start partitions 1 MiB into the disk.

Thanks,
Andy

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