[ubuntu-ar] No puedo arrancar ubuntu desde mi disco externo

[Carolina Kordon]

Hola! Acabo de instalar Ubuntu 10.04 en mi disco externo de 500gb, en el
cual hice una particion de 30gb para justamente realizar ahi la instalacion.
El problema es que cuando reinicie la PC, seleccione que bootee desde el
USB, pero de todas maneras inicio con el Debian que tengo instalado en la
maquina. Segun lei en algunos foros tengo que modificar el archivo grub.cfg,
pero en este caso no me deja modificarlo.

A continuacion copio el archivo:

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="0"
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 ${boot_once} ]; then save_env
recordfail; fi; fi
}
insmod ext2
set root='(hd2,1)'
search --no-floppy --fs-uuid --set 184cec45-0963-4e42-b1a1-42dabf17de2e
if loadfont /usr/share/grub/unicode.pf2 ; then
  set gfxmode=640x480
  insmod gfxterm
  insmod vbe
  if terminal_output gfxterm ; then true ; else
    # For backward compatibility with versions of terminal.mod that don't
    # understand terminal_output
    terminal gfxterm
  fi
fi
insmod ext2
set root='(hd2,1)'
search --no-floppy --fs-uuid --set 184cec45-0963-4e42-b1a1-42dabf17de2e
set locale_dir=($root)/boot/grub/locale
set lang=es
insmod gettext
if [ ${recordfail} = 1 ]; then
  set timeout=-1
else
  set timeout=10
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 2.6.32-28-generic' --class ubuntu --class
gnu-linux --class gnu --class os {
    recordfail
    insmod ext2
    set root='(hd2,1)'
    search --no-floppy --fs-uuid --set 184cec45-0963-4e42-b1a1-42dabf17de2e
    linux    /boot/vmlinuz-2.6.32-28-generic
root=UUID=184cec45-0963-4e42-b1a1-42dabf17de2e ro   quiet splash
    initrd    /boot/initrd.img-2.6.32-28-generic
}
menuentry 'Ubuntu, con Linux 2.6.32-28-generic (modo recuperación)' --class
ubuntu --class gnu-linux --class gnu --class os {
    recordfail
    insmod ext2
    set root='(hd2,1)'
    search --no-floppy --fs-uuid --set 184cec45-0963-4e42-b1a1-42dabf17de2e
    echo    'Cargando Linux 2.6.32-28-generic ...'
    linux    /boot/vmlinuz-2.6.32-28-generic
root=UUID=184cec45-0963-4e42-b1a1-42dabf17de2e ro single
    echo    'Cargando el disco RAM inicial...'
    initrd    /boot/initrd.img-2.6.32-28-generic
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
    insmod ext2
    set root='(hd2,1)'
    search --no-floppy --fs-uuid --set 184cec45-0963-4e42-b1a1-42dabf17de2e
    linux16    /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
    insmod ext2
    set root='(hd2,1)'
    search --no-floppy --fs-uuid --set 184cec45-0963-4e42-b1a1-42dabf17de2e
    linux16    /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Debian GNU/Linux, kernel 2.6.32-5-686 (on /dev/sda1)" {
    insmod ext2
    set root='(hd0,1)'
    search --no-floppy --fs-uuid --set 428c5b28-2920-4143-82b3-eb31f5ed2db2
    linux /boot/vmlinuz-2.6.32-5-686
root=UUID=428c5b28-2920-4143-82b3-eb31f5ed2db2 ro
    initrd /boot/initrd.img-2.6.32-5-686
}
menuentry "Debian GNU/Linux, kernel 2.6.32-5-686 (single-user mode) (on
/dev/sda1)" {
    insmod ext2
    set root='(hd0,1)'
    search --no-floppy --fs-uuid --set 428c5b28-2920-4143-82b3-eb31f5ed2db2
    linux /boot/vmlinuz-2.6.32-5-686
root=UUID=428c5b28-2920-4143-82b3-eb31f5ed2db2 ro single
    initrd /boot/initrd.img-2.6.32-5-686
}
menuentry "Debian GNU/Linux, kernel 2.6.26-2-686 (on /dev/sda1)" {
    insmod ext2
    set root='(hd0,1)'
    search --no-floppy --fs-uuid --set 428c5b28-2920-4143-82b3-eb31f5ed2db2
    linux /boot/vmlinuz-2.6.26-2-686
root=UUID=428c5b28-2920-4143-82b3-eb31f5ed2db2 ro
    initrd /boot/initrd.img-2.6.26-2-686
}
menuentry "Debian GNU/Linux, kernel 2.6.26-2-686 (single-user mode) (on
/dev/sda1)" {
    insmod ext2
    set root='(hd0,1)'
    search --no-floppy --fs-uuid --set 428c5b28-2920-4143-82b3-eb31f5ed2db2
    linux /boot/vmlinuz-2.6.26-2-686
root=UUID=428c5b28-2920-4143-82b3-eb31f5ed2db2 ro single
    initrd /boot/initrd.img-2.6.26-2-686
}
### 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 ###

Espero me puedan ayudar.

Saludos

-- 
Carolina Kordon
Blog de poesia: http://palabrasparaelalma.wordpress.com/
Blog de actuación: http://carolinakordonactuacion.wordpress.com/
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