No puedo modificar el grub2

En definitiva, eso. He mirado muchos tutoriales y ni cambiando con gedit los archivos ni con el administrador de arranque puedo. Tengo ubuntu 10.04 en este ordenador.
Gracias de antemano.
/boot/grub/grub.cfg

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by /usr/sbin/grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
load_env
fi
set default="5"
if [ ${prev_saved_entry} ]; then
set saved_entry=${prev_saved_entry}
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi

function savedefault {
if [ -z ${boot_once} ]; then
saved_entry=${chosen}
save_env saved_entry
fi
}

function recordfail {
set recordfail=1
if [ -n ${have_grubenv} ]; then if [ -z ${boot_once} ]; then save_env recordfail; fi; fi
}
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set a1450eed-c6a8-4622-9344-895971630c1f
if loadfont /usr/share/grub/unicode.pf2 ; then
set gfxmode=640x480
insmod gfxterm
insmod vbe
if terminal_output gfxterm ; then true ; else
# For backward compatibility with versions of terminal.mod that don't
# understand terminal_output
terminal gfxterm
fi
fi
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set a1450eed-c6a8-4622-9344-895971630c1f
set locale_dir=($root)/boot/grub/locale
set lang=es
insmod gettext
if [ ${recordfail} = 1 ]; then
set timeout=-1
else
set timeout=7
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Ubuntu, con Linux 2.6.32-45-generic' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set a1450eed-c6a8-4622-9344-895971630c1f
linux /boot/vmlinuz-2.6.32-45-generic root=UUID=a1450eed-c6a8-4622-9344-895971630c1f ro vga=791 quiet splash
initrd /boot/initrd.img-2.6.32-45-generic
}
menuentry 'Ubuntu, con Linux 2.6.32-45-generic (modo recuperación)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set a1450eed-c6a8-4622-9344-895971630c1f
echo 'Cargando Linux 2.6.32-45-generic ...'
linux /boot/vmlinuz-2.6.32-45-generic root=UUID=a1450eed-c6a8-4622-9344-895971630c1f ro single vga=791
echo 'Cargando el disco RAM inicial...'
initrd /boot/initrd.img-2.6.32-45-generic
}
menuentry 'Ubuntu, con Linux 2.6.31-14-generic' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set a1450eed-c6a8-4622-9344-895971630c1f
linux /boot/vmlinuz-2.6.31-14-generic root=UUID=a1450eed-c6a8-4622-9344-895971630c1f ro vga=791 quiet splash
initrd /boot/initrd.img-2.6.31-14-generic
}
menuentry 'Ubuntu, con Linux 2.6.31-14-generic (modo recuperación)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set a1450eed-c6a8-4622-9344-895971630c1f
echo 'Cargando Linux 2.6.31-14-generic ...'
linux /boot/vmlinuz-2.6.31-14-generic root=UUID=a1450eed-c6a8-4622-9344-895971630c1f ro single vga=791
echo 'Cargando el disco RAM inicial...'
initrd /boot/initrd.img-2.6.31-14-generic
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/10_lupin ###
### END /etc/grub.d/10_lupin ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Ubuntu, with Linux 2.6.32-28-generic (on /dev/sda6)" {
insmod ext2
set root='(hd0,6)'
search --no-floppy --fs-uuid --set 49ddec55-b1ef-4370-ae51-6b9197663d45
linux /boot/vmlinuz-2.6.32-28-generic root=UUID=49ddec55-b1ef-4370-ae51-6b9197663d45 ro quiet splash
initrd /boot/initrd.img-2.6.32-28-generic
}
menuentry "Ubuntu, with Linux 2.6.32-28-generic (recovery mode) (on /dev/sda6)" {
insmod ext2
set root='(hd0,6)'
search --no-floppy --fs-uuid --set 49ddec55-b1ef-4370-ae51-6b9197663d45
linux /boot/vmlinuz-2.6.32-28-generic root=UUID=49ddec55-b1ef-4370-ae51-6b9197663d45 ro single
initrd /boot/initrd.img-2.6.32-28-generic
}
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###