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I've just installed Windows 11 on the first partition of my disk,that's partitioned like this :

# fdisk /dev/sdb -l

Disk /dev/sdb: 465.76 GiB, 500107862016 bytes, 976773168 sectors
Disk model: Samsung SSD 860 
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x1967ba67


Device     Boot     Start       End   Sectors   Size Id Type
/dev/sdb1  *         2048 273092607 273090560 130.2G  7 HPFS/NTFS/exFAT
/dev/sdb2       273092608 274454527   1361920   665M 27 Hidden NTFS WinRE
/dev/sdb3       274456576 276553727   2097152     1G 82 Linux swap / Solaris
/dev/sdb4       276553728 976772477 700218750 333.9G 83 Linux

As you can see, Ubuntu 18.04 is installed on /dev/sdb3 and /dev/sdb4.

Previously Windows 10 was installed instead of Windows 11.

The problem is that the installation of Windows 11 broke grub2 that was installed on top of the disk /dev/sdb and now I want to reinstall it. I've tried to do like this :

# sudo grub-install --recheck --no-floppy --root-directory=/ /dev/sdb

But it gives this error :

Installing for x86_64-efi platform.
grub-install: error: cannot find EFI directory.

I think that it is a bug, because it detects an EFI partition, which isn't there. The disk has been formatted with MBR and it is DOS style and I have installed Windows 11 using RUFUS using the MBR method. Even /dev/sda is not EFI style :

# fdisk /dev/sda -l

Disk /dev/sda: 465.76 GiB, 500107862016 bytes, 976773168 sectors
Disk model: CT500MX500SSD4

Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0xa6e39599


Device     Boot Start       End   Sectors   Size Id Type
/dev/sda1  *     2048 976767672 976765625 465.8G 83 Linux

What's the right procedure here to reinstall grub2?

cipricus
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Marietto
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2 Answers2

1

I've used ubuntu 21.04 in "try" mode and I have installed Boot-Repair. I've chosen to reinstall grub2 on the /dev/sdb and it did all the necessary steps correctly. After rebooting I was able to boot ubuntu 18.04 installed on /dev/sdb4

Marietto
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0

Use the --target=i386-pc flag.

Source: https://wiki.archlinux.org/title/GRUB#Master_Boot_Record_(MBR)_specific_instructions

Satyam Bhardwaj
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