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Grub

Grub

Booting an OS From Grub

multiboot

boot to an installed GNU/Linux distro on your machine

set root=(hd0,PartionNumberWhere/BootIs)
linux /boot/vmlinuz-linux-libre root=/dev/sdaPartionNumberWhereRootIs
initrd /boot/initramfs-linux-libre.img
boot

For me this looks like:

set root=(hd0,1)
linux /boot/vmlinuz-linux-libre root=/dev/sda1
initrd /boot/initramfs-linux-libre.img
boot

chainloading

As soon as you see the grub command line press the “c” key. You’ll be dropped into a grub shell. You’ll know you’re there, because you’ll see

grub >

Now, this is what you type

set root=(

Now press TAB and grub will give you some options. Grub will expand what you wrote into

set root=(hd

Grub will then tell you to either press 1 or 0. hd0 is your hard drive. You don’t want that. So type

set root=(hd1)

Now type

chainloader +1

That will essentially tell the grub that is on your harddisk, to chainload to the usb. This means that the usb stick has grub (or some other similiar software on it). So grub won’t try to find a bootable kernel on the usb stick. Instead, your harddrive’s grub will hand over controll to the usb stick’s grub.

boot

Changing Grub’s keyboard layout

First, check that you’re using GRUB v2 or above.

grub-install –version

Generate a GRUB keyboard layout file. Below is the command for a french keyboard. For other languages, check usr/share/X11/xkb/symbols. Filename choice is not important (you can change bepo).

sudo grub-kbdcomp -o /boot/grub/bepo.gkb fr

Edit /etc/default/grub with root rights to have:

#GRUB_HIDDEN_TIMEOUT=0 GRUB_TERMINAL_INPUT=”at_keyboard”

Edit /etc/grub.d/40_custom with root rights to have:

#!/bin/sh exec tail -n +3 $0

insmod keylayouts keymap /boot/grub/bepo.gkb

Finally:

sudo update-grub

Note: Forget immediately about using the Shift key to display GRUB menu! It may be normal that terminal_input at_keyboard make this key not work anymore. So make sure #GRUB_HIDDEN_TIMEOUT=0 is properly commented.

http://askubuntu.com/questions/751259/how-to-change-grub-command-line-grub-shell-keyboard-layout