PPS: Wenn ich mich noch recht erinnere wurde der ältere Grub (Paket grub-legacy) in der MBR installiert und grub 2 wurde testweise mit Hilfe des chainloaders von grub-legacy gestartet und man kann nach einer gewissen Testzeit, grub 2 in den MBR installieren. Ich nutze aber immer noch den älteren Grub.
Du mußt mal in die Konfigurationsdatei /boot/grub/menu.lst gehen und schauen ob da ein chainloader Eintrag für grub 2 steht.
Der Chainloader von grub-legacy kann ein anderes Betriebsystem wie Windows oder einen anderen Bootloader wie grub 2 indirekt starten.
Der Chainloader startet dazu das jeweilioge Bootprogramm , welches im Bootsektor der jeweiligen Partition ist.
Beispiel:
cat /boot/grub/menu.lst
......
# This entry automatically added by the Debian installer for a non-linux OS
# on /dev/hda1
title Microsoft Windows XP Professional
rootnoverify (hd0,0)
savedefault
makeactive
chainloader +1
chainloader +1 bedeutet das der Bootsektor von (hd0,0) gestartet wird und damit dann auch Windows geladen wird. Wahrscheinlich wird bei dir der grub 2 mit Hilfe vom chainloader geladen, also indirekt sozusagen.
PS: Die ganze /boot/grub/menu.lst Konfigurationsdatei von meinem Debian Squeeze:
# 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-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 saved
## timeout sec
# Set a timeout, in SEC seconds, before automatically booting the default entry
# (normally the first entry defined).
timeout 20
# 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/hda8 ro vga=0x303 nouveau.modeset=0
## default grub root device
## e.g. groot=(hd0,0)
# groot=(hd0,7)
## 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=
## 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=true
## ## End Default Options ##
title Debian GNU/Linux, kernel 2.6.32-38-K7
root (hd0,7)
kernel /boot/vmlinuz-2.6.32-38-K7 root=/dev/hda8 ro vga=0x303 nouveau.modeset=0
savedefault
title Debian GNU/Linux, kernel 2.6.32-38-K7 (single-user mode)
root (hd0,7)
kernel /boot/vmlinuz-2.6.32-38-K7 root=/dev/hda8 ro vga=0x303 nouveau.modeset=0 single
savedefault
title Debian GNU/Linux, kernel 2.6.32-5-686
root (hd0,7)
kernel /boot/vmlinuz-2.6.32-5-686 root=/dev/hda8 ro vga=0x303 nouveau.modeset=0
initrd /boot/initrd.img-2.6.32-5-686
savedefault
title Debian GNU/Linux, kernel 2.6.32-5-686 (single-user mode)
root (hd0,7)
kernel /boot/vmlinuz-2.6.32-5-686 root=/dev/hda8 ro vga=0x303 nouveau.modeset=0 single
initrd /boot/initrd.img-2.6.32-5-686
savedefault
title Debian GNU/Linux, kernel memtest86
root (hd0,7)
kernel /boot/memtest86.bin
title Debian GNU/Linux, kernel memtest86+
root (hd0,7)
kernel /boot/memtest86+.bin
### 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/hda1
#title Microsoft Windows XP Professional
#rootnoverify (hd0,0)
#savedefault
#makeactive
#chainloader +1
KarstenW
