After upgrading GRUB to v2.12 it worked as expected
En miércoles, 3 de diciembre de 2025, 09:21:59 CET, Javi Jap
<[email protected]> escribió:
Thanks for the answer, it makes sense to use "--rbind", indeed. But that is
not the cause of the issue, I have tried and it is still failing with the same
error
En lunes, 1 de diciembre de 2025, 20:15:54 CET, Randy Goldenberg
<[email protected]> escribió:
I don't know if this is the cause of the issue you've reported or not, but
when preparing your chroot you need to mount /sys using "--rbind" rather than
"--bind", to include the mount at /sys/firmware/efi/efivars in the chroot.
"--rbind" would also be recommended on the /dev bind, to include /dev/pts in
the chroot.
On Mon, Dec 1, 2025 at 8:58 AM Javi Jap via Support requests for the GRand
Unified Bootloader <[email protected]> wrote:
Hi,
I'm running Ubuntu 22.04 in a HDD (/dev/sdd) and I have a 2T SSD disk
(/dev/sdb) where I have another ubuntu installed and that is partitioned like
this:
$ sudo gdisk -l /dev/sdbGPT fdisk (gdisk) version 1.0.8
Partition table scan: MBR: protective BSD: not present APM: not present
GPT: present
Found valid GPT with protective MBR; using GPT.Disk /dev/sdb: 3907029168
sectors, 1.8 TiBModel: Samsung SSD 870 Sector size (logical/physical): 512/512
bytesDisk identifier (GUID): C04E1719-7349-4D27-BB25-B8FDF867C2C1Partition
table holds up to 128 entriesMain partition table begins at sector 2 and ends
at sector 33First usable sector is 34, last usable sector is
3907029134Partitions will be aligned on 2048-sector boundariesTotal free space
is 4205 sectors (2.1 MiB)
Number Start (sector) End (sector) Size Code Name 1
2048 1015807 495.0 MiB EF00 EFI system partition 2
1015808 3112959 1024.0 MiB 8300 Linux filesystem 3
3112960 259753983 122.4 GiB 8300 Linux filesystem 4
259753984 3869278207 1.7 TiB 8300 Linux filesystem 5
3869280256 3907028991 18.0 GiB 8200
sdb2 is the boot partition, and sdb3 and sdb4 root and home respectively.
The EFI partition (/dev/sdb1) has boot and esp flags:
$ sudo parted /dev/sdb print Model: ATA Samsung SSD 870 (scsi) Disk /dev/sdb:
2000GB Sector size (logical/physical): 512B/512B Partition Table: gpt Disk
Flags:
Number Start End Size File system Name Flags 1
1049kB 520MB 519MB fat32 EFI system partition boot, esp 2
520MB 1594MB 1074MB ext4 Linux filesystem 3 1594MB 133GB
131GB ext4 Linux filesystem 4 133GB 1981GB 1848GB ext4
Linux filesystem 5 1981GB 2000GB 19,3GB linux-swap(v1)
swap
When I try to install grub in that partition it fails with the error:
grub-install: error: unknown filesystem.
I've seen other people say that this is solved by disabling the
metadata_csum_seedfeature but in my case that doesn't solve the issue.
To install grub in /dev/sdb I mount root (/dev/sdb3) in /mnt, then I mount boot
partition in /mnt/boot and efi partition in /mnt/boot/efi. Then I bind my
running ubuntu's dev, proc and sys with the mounted root and chroot to it. When
I execute grub-installcommand to install grub it fails with the error mentioned
before:
$ sudo mount /dev/sdb3 /mnt/$ sudo mount /dev/sdb2 /mnt/boot/$ sudo mount
/dev/sdb1 /mnt/boot/efi/$ sudo mount --bind /dev /mnt/dev$ sudo mount --bind
/proc /mnt/proc$ sudo mount --bind /sys /mnt/sys$ sudo chroot
/mntroot@LINUX-WS:/# grub-install --target=x86_64-efi --efi-directory=/boot/efi
--bootloader-id=GRUBInstalling for x86_64-efi platform.grub-install: error:
unknown filesystem.
if I run the grub-install command with high verbosity (-vv) I get a Read out of
rangeerror before failing, maybe this is a hint of what it is happening but I
have no idea.
root@LINUX-WS:/# grub-install --target=x86_64-efi --efi-directory=/boot/efi
--bootloader-id=GRUB -vv[...]grub-core/kern/fs.c:56: Detecting cbfs...
grub-core/kern/disk.c:420: Read out of range: sector 0x200000 (attempt to read
or write outside of partition). grub-core/kern/fs.c:78: cbfs detection failed.
grub-core/kern/fs.c:56: Detecting btrfs... grub-core/kern/fs.c:78: btrfs
detection failed. grub-core/kern/fs.c:56: Detecting bfs...
grub-core/kern/fs.c:78: bfs detection failed. grub-core/kern/fs.c:56: Detecting
afs... grub-core/kern/fs.c:78: afs detection failed. grub-core/kern/fs.c:56:
Detecting affs... grub-core/kern/fs.c:78: affs detection failed. grub-install:
error: unknown filesystem.
Any help will be much appreciated!
