Grub ne trouve pas la partition boot



Lorsque Grub ne trouve pas la partition boot, il est tout de même possible d’accéder au shell.
Il faut alors ouvrir le fichier grub/menu.lst et vérifier les lignes contenant hd(0,0) hd(1,0), …

Voici le contenu du fichier grub.lst pour une Debian Lenny (ça peut servir pour comparer …) :

# menu.lst - See: grub(8), info grub, update-grub(8)
 # grub-install(8), grub-floppy(8),
 # grub-md5-crypt, /usr/share/doc/grub
 # and /usr/share/doc/grub-legacy-doc/.
## default num
 # Set the default entry to the entry number NUM. Numbering starts from 0, and
 # the entry number 0 is the default if the command is not used.
 #
 # You can specify 'saved' instead of a number. In this case, the default entry
 # is the entry saved with the command 'savedefault'.
 # WARNING: If you are using dmraid do not change this entry to 'saved' or your
 # array will desync and will not let you boot your system.
 default 0
## timeout sec
 # Set a timeout, in SEC seconds, before automatically booting the default entry
 # (normally the first entry defined).
 timeout 5
# Pretty colours
 color cyan/blue white/blue
## password ['--md5'] passwd
 # If used in the first section of a menu file, disable all interactive editing
 # control (menu entry editor and command-line) and entries protected by the
 # command 'lock'
 # e.g. password topsecret
 # password --md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/
 # password topsecret
#
 # examples
 #
 # title Windows 95/98/NT/2000
 # root (hd0,0)
 # makeactive
 # chainloader +1
 #
 # title Linux
 # root (hd0,1)
 # kernel /vmlinuz root=/dev/hda2 ro
 #
#
 # Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST
### BEGIN AUTOMAGIC KERNELS LIST
 ## lines between the AUTOMAGIC KERNELS LIST markers will be modified
 ## by the debian update-grub script except for the default options below
## DO NOT UNCOMMENT THEM, Just edit them to your needs
## ## Start Default Options ##
 ## default kernel options
 ## default kernel options for automagic boot options
 ## If you want special options for specific kernels use kopt_x_y_z
 ## where x.y.z is kernel version. Minor versions can be omitted.
 ## e.g. kopt=root=/dev/hda1 ro
 ## kopt_2_6_8=root=/dev/hdc1 ro
 ## kopt_2_6_8_2_686=root=/dev/hdc2 ro
 # kopt=root=/dev/sdb3 ro
## default grub root device
 ## e.g. groot=(hd0,0)
 # groot=(hd1,0)
## should update-grub create alternative automagic boot options
 ## e.g. alternative=true
 ## alternative=false
 # alternative=true
## should update-grub lock alternative automagic boot options
 ## e.g. lockalternative=true
 ## lockalternative=false
 # lockalternative=false
## additional options to use with the default boot option, but not with the
 ## alternatives
 ## e.g. defoptions=vga=791 resume=/dev/hda5
 # defoptions=quiet
## should update-grub lock old automagic boot options
 ## e.g. lockold=false
 ## lockold=true
 # lockold=false
## Xen hypervisor options to use with the default Xen boot option
 # xenhopt=
 ## Xen Linux kernel options to use with the default Xen boot option
 # xenkopt=console=tty0
## altoption boot targets option
 ## multiple altoptions lines are allowed
 ## e.g. altoptions=(extra menu suffix) extra boot options
 ## altoptions=(single-user) single
 # altoptions=(single-user mode) single
## controls how many kernels should be put into the menu.lst
 ## only counts the first occurence of a kernel, not the
 ## alternative kernel options
 ## e.g. howmany=all
 ## howmany=7
 # howmany=all
## should update-grub create memtest86 boot option
 ## e.g. memtest86=true
 ## memtest86=false
 # memtest86=true
## should update-grub adjust the value of the default booted system
 ## can be true or false
 # updatedefaultentry=false
## should update-grub add savedefault to the default options
 ## can be true or false
 # savedefault=false
## ## End Default Options ##
title Debian GNU/Linux, kernel 2.6.26-2-amd64
 root (hd0,0)
 kernel /vmlinuz-2.6.26-2-amd64 root=/dev/sdb3 ro quiet
 initrd /initrd.img-2.6.26-2-amd64
title Debian GNU/Linux, kernel 2.6.26-2-amd64 (single-user mode)
 root (hd0,0)
 kernel /vmlinuz-2.6.26-2-amd64 root=/dev/sdb3 ro single
 initrd /initrd.img-2.6.26-2-amd64
### END DEBIAN AUTOMAGIC KERNELS LIST
# This is a divider, added to separate the menu items below from the Debian
 # ones.
 title Other operating systems:
 root
# This entry automatically added by the Debian installer for a non-linux OS
 # on /dev/sda1
 title Windows Vista/Longhorn (loader)
 root (hd1,0)
 savedefault
 chainloader +1




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