How to Reinstall GRUB (Alternate Method)

In this video, I show you another, better way to reinstall the GRUB bootloader on Linux.

Prerequisites:
1. A Linux install media (any GRUB-based distribution with a live ISO should do)
THAT'S IT!

Commands used in this video:
Mount root partition: sudo mount /dev/sdXY /mnt (example: sudo mount /dev/sda3 /mnt)
Mount boot partition (if applicable): sudo mount /dev/sdXY /mnt/boot (example: sudo mount /dev/sda2 /mnt/boot)
Mount EFI System partition (if applicable): sudo mount /dev/sdXY /mnt/boot/efi (example: sudo mount /dev/sda1 /mnt/boot/efi)
Setup "bind" mounts:
sudo mount --bind /dev /mnt/dev
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys /mnt/sys
Chroot into your Linux installation: sudo chroot /mnt
Reinstall GRUB (in chroot): grub-install /dev/sdX (example: grub-install /dev/sda)
Regenerate GRUB configuration file (in chroot): update-grub
Exit chroot: exit

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[SakugaAsu]

All my drives were wiped by accident, I wanted to fully wipe Linux and reinstall Windows 11. But I can't get Windows installed because the installer doesn't recognize Linux partitions.

[laikanoother]

show de bola! I shall try here if my Linux boot ; greetings from Brazil!

[hrushigawade]

God bless you 🙏

Simple and effective explanation, with all minor details

Thanks for saving life

[Stevenagetheidlegame]

When i try to mount my dev sda 3 or 2 it says

mount: /mnt: wrong fa type, bad option, bad superblock on dev/sda3, missing codepage or helper program, or other error. dmesg(1) may have more information after failed mount system call

[pegasuszarafa]

At 4:44, when I run
'grub-install /dev/sda'
I get an error:
Cannot find EFI directory.

I've dual-booted Ubuntu Jammy with Windows 10, both on separate partitions in Legacy. What should I do?

[johnthomas]

Drew - Good job. But I'm still not getting a menu for me to select my windows or linux mint (22) install. However, I should note that my BIOS is not showing any linux in the boot order. I had installed LM a couple weeks ago from a USB stick and it ran fine. Not sure if it is pertinent, but I had not rebooted until I needed to do something in Windows. And when I rebooted into Windows, it said it had a security update it wanted to do, and I let it. Soon after, I tried to reboot into LM, but could not find any way - other than booting again from my (live?) USB. Then, if I bring up a Files app, I can see the partition (84 GB /dev/sda8) and the LM files in it. But no way to boot into it. I've tried grub-repair, and been thru several youtube vids inclucing this one, but nada. I did get a cpl of Warnings during your "grub-install /dev/sda" step stating "EFI variables cannot be set on this system." and "You will have to complete the GRUB setup manually". I didn't know what I had to do at that point. I don't have any data to speak of on that install yet - just setup of printers, etc, so I'm seriously thinking of redoing the install. (sorry for the long post...) Any suggestions?

[jamesmarsh]

whenever i try to chroot it says failed to run command '/bin.bash' : no such file or directory. im trying to recover a digital ocean droplet after it was destroyed by an angry ex-admin

[panayiotispetousis]

I get a chroot segmentation fault error do u happen to know what this is?

[michaelcanino]

I tried your method on a VM of Jammy Jellyfish and it seemed to work well, but when I tried it on my SSD I still get the following error: Error: invalid environment block. 452: out of range pointer: 0xcfff020 Aborted. Press any key to exit. Hitting a key on the keyboard continues the boot process but I never had to hit a key for the OS to boot. If you know what is happening could you give me a hand on trying to fix this? Thanks!

[luigiprovencher]

The problem for me is that with the other video you don't show how to do it if you've got a separate boot partition like you mentioned. So I'm guessing that it only works for ubuntu based systems or certain installation methods.

[imacmill]

This looks identical to your first video.

[FlamingSwordful]

Just as my caddy broke, thx for the vid

[SkinnyThekittycat]

I need help. It won’t work. I need this. computer! Please help

[marcooos]

Followed everything. No errors. Didn't work.

[riccardowanke]

when I try "grub-install /dev/XXY" I got "grub-install: command not found". Any idea?

[neelchaudhary]

I started facing this issue today, when i was installing figlet-fonts
How do i reach to terminal as you suddenly reach from this grub rescue place