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I screwed up the grub.cfg file in ubuntu and now i cant boot to that partition. What do i need to put in the file to be able to boot from that partition?

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migrated from Jul 5 '12 at 13:29

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What version of grub are you using? – Conner Jul 3 '12 at 19:02

If you're using grub2 you can just run a sudo update-grub to find the correct OSes and generate a new cfg.

From a live CD, you'll have to mount your partition:

sudo mkdir /mnt/root
sudo mount -t ext3 <your ubuntu partition, example /dev/sda4> /mnt/root
sudo mount -t proc none /mnt/root/proc
sudo mount -o bind /dev /mnt/root/dev
sudo chroot /mnt/root /bin/bash
sudo update-grub
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so i'm using grub2. but i'm in a live cd at the moment. – user1450296 Jul 3 '12 at 19:10
Result: Sudo: update-grub: command not found – user1450296 Jul 3 '12 at 20:01
@user1450296: that makes no sense. Conner is perfectly right. He explained all the steps to get into the system from a live CD or an ordinary boot CD. Grub2 wouldn't be installed without also having update-grub. – 0xC0000022L Jul 5 '12 at 13:33
hi! is there anything to do if after performing update-grub, the problem isn't fixed? for me, I do it from an Ubuntu partition (I use dual-boot system on the same hard disk) – Shawn Le Oct 12 '14 at 13:53

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