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===== Grub =====

To install the Grub-Bootloader manually invoke the grub shell with

  grub
  
Afterwards you have to execute

  device
  root
  setup
  
commands with harddiskparameter (hdX and hdX,X) for all devices!

Example:

<code>
grub> device (hd1) /dev/sdb
device (hd1) /dev/sdb
grub> root (hd1,0)
root (hd1,0)
 Filesystem type is ext2fs, partition type 0x83
grub> setup (hd1)
setup (hd1)
 Checking if "/boot/grub/stage1" exists... no
 Checking if "/grub/stage1" exists... yes
 Checking if "/grub/stage2" exists... yes
 Checking if "/grub/e2fs_stage1_5" exists... yes
 Running "embed /grub/e2fs_stage1_5 (hd1)"...  15 sectors are embedded.
succeeded
 Running "install /grub/stage1 (hd1) (hd1)1+15 p (hd1,0)/grub/stage2 /grub/grub.conf"... succeeded
Done.
</code>

Enter

  quit
  
to save and leave the grub shell.

==== Grub Start Commands ====

=== Runlevel ===

To boot to a particular runlevel (1,2,3 ...) just enter in grub-bootmenu the number of level you want:

  1

Default-runlevel which is set in "/etc/inittab" will be ignored.  

=== Select device to boot from ===

To select root partition manually on boot just set "root=/dev/hda7" as start parameter

To set it permanently add the following syntax in /boot/grub/menu.lst:

<code>
title linux
   kernel (hd0,4)/vmlinuz root=/dev/hda7 vga=791
   initrd (hd0,4)/initrd
</code>

=== Recover Root-Password ===

If you have to recover your password start with

grub:

  init=/bin/bash

lilo:

  linux init=/bin/bash
  
=== Recover Root-Password Ubuntu Server 12.4 ===

Enter the Grub-Shell with "e", go to the very end of the line "linux", change the "ro" to "rw" and add 

  init=/bin/bash

press enter, then press F10 to boot your system. 
  
See also: https://help.ubuntu.com/community/LostPassword
  
=== Ubuntu ===
grub rescue:

http://www.it-muecke.de/grub-rescue