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Install Grub from chroot

December 21, 2010 by Igor Drobot 16 Comments

The simple way to install grub/ grub2 from any linux live-CD or any other bootable medium.

Step 1: boot from linux live CD/DVD or even USB
Step 2: mount your hdd
Step 3: chroot in the mounted filesystem
Step 3: install grub
Step 4: reboot

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fdisk -l
mount /dev/sda1 /mnt/
mount -t proc none /mnt/proc
mount -o bind /dev /mnt/dev
mount -t sysfs sys /mnt/sys
chroot /mnt/ /bin/bash
update-grub
/usr/sbin/grub-install --recheck --no-floppy /dev/sda
sync & reboot

fdisk -l mount /dev/sda1 /mnt/ mount -t proc none /mnt/proc mount -o bind /dev /mnt/dev mount -t sysfs sys /mnt/sys chroot /mnt/ /bin/bash update-grub /usr/sbin/grub-install --recheck --no-floppy /dev/sda sync & reboot

SUSE Syntax:
update-grub is debian and ubuntu little helper this execute the same as:

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grub2-install --recheck --no-floppy /dev/sda
grub2-mkconfig -o /boot/grub2/grub.cfg
mkinitrd

grub2-install --recheck --no-floppy /dev/sda grub2-mkconfig -o /boot/grub2/grub.cfg mkinitrd

Filed Under: Bash, Debian, Ubuntu Tagged With: chroot, Debian, Grub, Grub2, install grub, MBR, openSUSE, Ubuntu

Grub2

September 5, 2010 by Igor Drobot Leave a Comment

To see the grub menu on boot, edit the default grub config and decomment the following line:

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vim /etc/default/grub
#GRUB_HIDDEN_TIMEOUT=0

vim /etc/default/grub #GRUB_HIDDEN_TIMEOUT=0

This is the default setting with only one identified operating system.

By the way, to force Grub 2 to show the menu on boot just hold down the Shift key while Grub is starting.

Filed Under: Debian, Linux, Ubuntu Tagged With: Grub, Grub2