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Thread: Boot loader problem

  1. #1
    Join Date
    Jan 2011
    Beans
    1

    Boot loader problem

    So last week I used an Ubuntu CD on my laptop to install Ubuntu to an external hard drive. It seemed to work fine: when I booted my computer with the external hard drive connected, I got the grub screen and was able to choose from either Windows Vista (on my laptop) or Ubuntu (from the external hard drive).

    But when I try to start the computer without the Ubuntu hard drive connected, I just get a "device not found" error and the grub-rescue> prompt, which won't accept any commands. This wouldn't be a hugely pressing problem for me, except that my computer has for some reason just decided to stop recognizing the hard drive with Ubuntu on it, which means that whether or not it's connected to my laptop, my laptop still can't find grub and so it can't boot and just gets stuck at grub-rescue>.

    I would really like to fix this so that I can use my laptop. Thanks!

  2. #2
    Join Date
    Sep 2008
    Location
    Philadelphia, PA
    Beans
    5,193
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Boot loader problem

    It would seem that you installed GRUB to MBR of your internal disk, so when the external is not plugged in the files needed to boot can not be located. The solution is very simple but first I need to be sure of your boot process. Do this with the external disk plugged in:

    Let's get a better look at your setup & boot process. Boot into Ubuntu. Come back here and do the following:

    1. Download the boot info script. There is a link in my signature.
    2. Move the boot info script to the desktop.
    3. Open a terminal and run the command
    Code:
    sudo bash ~/Desktop/boot_info_script*.sh
    This will create a RESULTS.txt file on the desktop. Paste the entire contents of that file back here. Once pasted highlight all text and click the # sign on the toolbar to place code tags around the text.

    See here for more info on the boot info script.
    Multi-boot: Arch linux, Ubuntu 12.04, Windows 7 & Windows 8

  3. #3
    Join Date
    Jan 2011
    Beans
    2

    Re: Boot loader problem

    Hi. If I may, I would like to post my result for a similar problem of bootloasder settings scattered on two hard drivers (internal + external), and would like your opinion on how to solve this annoyance.

    cheer!
    plusunim

    -------------------------------------------------------

    Boot Info Script 0.55 dated February 15th, 2010
    ============================= Boot Info Summary: ==============================
    => Grub 2 is installed in the MBR of /dev/sda and looks on the same drive in
    partition #1 for (,msdos1)/boot/grub.
    => No boot loader is installed in the MBR of /dev/sdb
    => No boot loader is installed in the MBR of /dev/sdc
    sda1: __________________________________________________ _______________________
    File system: vfat
    Boot sector type: Dell Utility: Fat16
    Boot sector info: No errors found in the Boot Parameter Block.
    Operating System:
    Boot files/dirs: /COMMAND.COM
    sda2: __________________________________________________ _______________________
    File system: ntfs
    Boot sector type: Windows Vista/7
    Boot sector info: No errors found in the Boot Parameter Block.
    Operating System: Windows XP
    Boot files/dirs: /boot.ini /bootmgr /boot/BCD /ntldr /NTDETECT.COM
    sdb1: __________________________________________________ _______________________
    File system: ext4
    Boot sector type: -
    Boot sector info:
    Operating System: Ubuntu 10.10
    Boot files/dirs: /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img
    sdb2: __________________________________________________ _______________________
    File system: Extended Partition
    Boot sector type: -
    Boot sector info:
    sdb5: __________________________________________________ _______________________
    File system: swap
    Boot sector type: -
    Boot sector info:
    sdc1: __________________________________________________ _______________________
    File system: vfat
    Boot sector type: Fat16
    Boot sector info: No errors found in the Boot Parameter Block.
    Operating System:
    Boot files/dirs:
    =========================== Drive/Partition Info: =============================
    Drive: sda ___________________ __________________________________________________ ___
    Disk /dev/sda: 320.1 GB, 320072933376 bytes
    255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    Partition Boot Start End Size Id System
    /dev/sda1 63 80,324 80,262 de Dell Utility
    /dev/sda2 * 81,920 625,140,399 625,058,480 7 HPFS/NTFS

    Drive: sdb ___________________ __________________________________________________ ___
    Disk /dev/sdb: 320.1 GB, 320072933376 bytes
    255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    Partition Boot Start End Size Id System
    /dev/sdb1 2,048 600,565,759 600,563,712 83 Linux
    /dev/sdb2 600,567,806 625,141,759 24,573,954 5 Extended
    /dev/sdb5 600,567,808 625,141,759 24,573,952 82 Linux swap / Solaris

    Drive: sdc ___________________ __________________________________________________ ___
    Disk /dev/sdc: 2019 MB, 2019557376 bytes
    19 heads, 18 sectors/track, 11533 cylinders, total 3944448 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    Partition Boot Start End Size Id System
    /dev/sdc1 64 3,944,447 3,944,384 6 FAT16

    blkid -c /dev/null: __________________________________________________ __________
    Device UUID TYPE LABEL
    /dev/sda1 3030-3030 vfat DellUtility
    /dev/sda2 061E52481E523143 ntfs Hard Disk
    /dev/sda: PTTYPE="dos"
    /dev/sdb1 ca8b4eb9-696a-4117-adc6-4f9e96d2969c ext4
    /dev/sdb2: PTTYPE="dos"
    /dev/sdb5 d8431925-6f97-4b4e-ba8e-c789ff1e8ebc swap
    /dev/sdb: PTTYPE="dos"
    /dev/sdc1 74F5-BDD1 vfat
    /dev/sdc: PTTYPE="dos"
    ============================ "mount | grep ^/dev output: ===========================
    Device Mount_Point Type Options
    /dev/sdb1 / ext4 (rw,errors=remount-ro,commit=0)
    /dev/sr0 /media/Ubuntu 10.10 i386 iso9660 (ro,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000, iocharset=utf8,mode=0400,dmode=0500)
    /dev/sdc1 /media/74F5-BDD1 vfat (rw,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000, shortname=mixed,dmask=0077,utf8=1,showexec,flush)

    ================================ sda2/boot.ini: ================================
    [boot loader]
    timeout=30
    default=multi(0)disk(0)rdisk(0)partition(2)\WINDOW S
    [operating systems]
    multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Micro soft Windows XP Professional" /noexecute=optin /fastdetect
    =========================== sdb1/boot/grub/grub.cfg: ===========================
    #
    # DO NOT EDIT THIS FILE
    #
    # It is automatically generated by grub-mkconfig using templates
    # from /etc/grub.d and settings from /etc/default/grub
    #
    ### BEGIN /etc/grub.d/00_header ###
    if [ -s $prefix/grubenv ]; then
    set have_grubenv=true
    load_env
    fi
    set default="0"
    if [ "${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 "${boot_once}" ]; then save_env recordfail; fi; fi
    }
    function load_video {
    insmod vbe
    insmod vga
    }
    insmod part_msdos
    insmod ext2
    set root='(hd1,msdos1)'
    search --no-floppy --fs-uuid --set ca8b4eb9-696a-4117-adc6-4f9e96d2969c
    if loadfont /usr/share/grub/unicode.pf2 ; then
    set gfxmode=640x480
    load_video
    insmod gfxterm
    fi
    terminal_output gfxterm
    insmod part_msdos
    insmod ext2
    set root='(hd1,msdos1)'
    search --no-floppy --fs-uuid --set ca8b4eb9-696a-4117-adc6-4f9e96d2969c
    set locale_dir=($root)/boot/grub/locale
    set lang=en
    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, with Linux 2.6.35-22-generic' --class ubuntu --class gnu-linux --class gnu --class os {
    recordfail
    insmod part_msdos
    insmod ext2
    set root='(hd1,msdos1)'
    search --no-floppy --fs-uuid --set ca8b4eb9-696a-4117-adc6-4f9e96d2969c
    linux /boot/vmlinuz-2.6.35-22-generic root=UUID=ca8b4eb9-696a-4117-adc6-4f9e96d2969c ro quiet splash
    initrd /boot/initrd.img-2.6.35-22-generic
    }
    menuentry 'Ubuntu, with Linux 2.6.35-22-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
    recordfail
    insmod part_msdos
    insmod ext2
    set root='(hd1,msdos1)'
    search --no-floppy --fs-uuid --set ca8b4eb9-696a-4117-adc6-4f9e96d2969c
    echo 'Loading Linux 2.6.35-22-generic ...'
    linux /boot/vmlinuz-2.6.35-22-generic root=UUID=ca8b4eb9-696a-4117-adc6-4f9e96d2969c ro single
    echo 'Loading initial ramdisk ...'
    initrd /boot/initrd.img-2.6.35-22-generic
    }
    ### END /etc/grub.d/10_linux ###
    ### BEGIN /etc/grub.d/20_linux_xen ###
    ### END /etc/grub.d/20_linux_xen ###
    ### BEGIN /etc/grub.d/20_memtest86+ ###
    menuentry "Memory test (memtest86+)" {
    insmod part_msdos
    insmod ext2
    set root='(hd1,msdos1)'
    search --no-floppy --fs-uuid --set ca8b4eb9-696a-4117-adc6-4f9e96d2969c
    linux16 /boot/memtest86+.bin
    }
    menuentry "Memory test (memtest86+, serial console 115200)" {
    insmod part_msdos
    insmod ext2
    set root='(hd1,msdos1)'
    search --no-floppy --fs-uuid --set ca8b4eb9-696a-4117-adc6-4f9e96d2969c
    linux16 /boot/memtest86+.bin console=ttyS0,115200n8
    }
    ### END /etc/grub.d/20_memtest86+ ###
    ### BEGIN /etc/grub.d/30_os-prober ###
    menuentry "Windows Vista (loader) (on /dev/sda2)" {
    insmod part_msdos
    insmod ntfs
    set root='(hd0,msdos2)'
    search --no-floppy --fs-uuid --set 061e52481e523143
    chainloader +1
    }
    ### 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 ###
    ### BEGIN /etc/grub.d/41_custom ###
    if [ -f $prefix/custom.cfg ]; then
    source $prefix/custom.cfg;
    fi
    ### END /etc/grub.d/41_custom ###
    =============================== sdb1/etc/fstab: ===============================
    # /etc/fstab: static file system information.
    #
    # Use 'blkid -o value -s UUID' to print the universally unique identifier
    # for a device; this may be used with UUID= as a more robust way to name
    # devices that works even if disks are added and removed. See fstab(5).
    #
    # <file system> <mount point> <type> <options> <dump> <pass>
    proc /proc proc nodev,noexec,nosuid 0 0
    /dev/sdb1 / ext4 errors=remount-ro 0 1
    /dev/sdb5 none swap sw 0 0
    =================== sdb1: Location of files loaded by Grub: ===================

    202.0GB: boot/grub/core.img
    64.6GB: boot/grub/grub.cfg
    .6GB: boot/initrd.img-2.6.35-22-generic
    202.0GB: boot/vmlinuz-2.6.35-22-generic
    .6GB: initrd.img
    202.0GB: vmlinuz

  4. #4
    Join Date
    Sep 2008
    Location
    Philadelphia, PA
    Beans
    5,193
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Boot loader problem

    Quote Originally Posted by plusunim View Post
    Hi. If I may, I would like to post my result for a similar problem of bootloasder settings scattered on two hard drivers (internal + external), and would like your opinion on how to solve this annoyance.

    cheer!
    plusunim

    Code:
    -------------------------------------------------------
     
                    Boot Info Script 0.55    dated February 15th, 2010                    
    ============================= Boot Info Summary: ==============================
     => Grub 2 is installed in the MBR of /dev/sda and looks on the same drive in 
        partition #1 for (,msdos1)/boot/grub.
     => No boot loader is installed in the MBR of /dev/sdb
     => No boot loader is installed in the MBR of /dev/sdc
    sda1: _________________________________________________________________________
        File system:       vfat
        Boot sector type:  Dell Utility: Fat16
        Boot sector info:  No errors found in the Boot Parameter Block.
        Operating System:  
        Boot files/dirs:   /COMMAND.COM
    sda2: _________________________________________________________________________
        File system:       ntfs
        Boot sector type:  Windows Vista/7
        Boot sector info:  No errors found in the Boot Parameter Block.
        Operating System:  Windows XP
        Boot files/dirs:   /boot.ini /bootmgr /boot/BCD /ntldr /NTDETECT.COM
    sdb1: _________________________________________________________________________
        File system:       ext4
        Boot sector type:  -
        Boot sector info:  
        Operating System:  Ubuntu 10.10
        Boot files/dirs:   /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img
    sdb2: _________________________________________________________________________
        File system:       Extended Partition
        Boot sector type:  -
        Boot sector info:  
    sdb5: _________________________________________________________________________
        File system:       swap
        Boot sector type:  -
        Boot sector info:  
    sdc1: _________________________________________________________________________
        File system:       vfat
        Boot sector type:  Fat16
        Boot sector info:  No errors found in the Boot Parameter Block.
        Operating System:  
        Boot files/dirs:   
    =========================== Drive/Partition Info: =============================
    Drive: sda ___________________ _____________________________________________________
    Disk /dev/sda: 320.1 GB, 320072933376 bytes
    255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    Partition  Boot         Start           End          Size  Id System
    /dev/sda1                  63        80,324        80,262  de Dell Utility
    /dev/sda2    *         81,920   625,140,399   625,058,480   7 HPFS/NTFS
    
    Drive: sdb ___________________ _____________________________________________________
    Disk /dev/sdb: 320.1 GB, 320072933376 bytes
    255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    Partition  Boot         Start           End          Size  Id System
    /dev/sdb1               2,048   600,565,759   600,563,712  83 Linux
    /dev/sdb2         600,567,806   625,141,759    24,573,954   5 Extended
    /dev/sdb5         600,567,808   625,141,759    24,573,952  82 Linux swap / Solaris
    
    Drive: sdc ___________________ _____________________________________________________
    Disk /dev/sdc: 2019 MB, 2019557376 bytes
    19 heads, 18 sectors/track, 11533 cylinders, total 3944448 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    Partition  Boot         Start           End          Size  Id System
    /dev/sdc1                  64     3,944,447     3,944,384   6 FAT16
    
    blkid -c /dev/null: ____________________________________________________________
    Device           UUID                                   TYPE       LABEL                         
    /dev/sda1        3030-3030                              vfat       DellUtility                   
    /dev/sda2        061E52481E523143                       ntfs       Hard Disk                     
    /dev/sda: PTTYPE="dos" 
    /dev/sdb1        ca8b4eb9-696a-4117-adc6-4f9e96d2969c   ext4                                     
    /dev/sdb2: PTTYPE="dos" 
    /dev/sdb5        d8431925-6f97-4b4e-ba8e-c789ff1e8ebc   swap                                     
    /dev/sdb: PTTYPE="dos" 
    /dev/sdc1        74F5-BDD1                              vfat                                     
    /dev/sdc: PTTYPE="dos" 
    ============================ "mount | grep ^/dev  output: ===========================
    Device           Mount_Point              Type       Options
    /dev/sdb1        /                        ext4       (rw,errors=remount-ro,commit=0)
    /dev/sr0         /media/Ubuntu 10.10 i386 iso9660    (ro,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000,iocharset=utf8,mode=0400,dmode=0500)
    /dev/sdc1        /media/74F5-BDD1         vfat       (rw,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,showexec,flush)
    
    ================================ sda2/boot.ini: ================================
    [boot loader]
    timeout=30
    default=multi(0)disk(0)rdisk(0)partition(2)\WINDOWS
    [operating systems]
    multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect
    =========================== sdb1/boot/grub/grub.cfg: ===========================
    #
    # DO NOT EDIT THIS FILE
    #
    # It is automatically generated by grub-mkconfig using templates
    # from /etc/grub.d and settings from /etc/default/grub
    #
    ### BEGIN /etc/grub.d/00_header ###
    if [ -s $prefix/grubenv ]; then
      set have_grubenv=true
      load_env
    fi
    set default="0"
    if [ "${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 "${boot_once}" ]; then save_env recordfail; fi; fi
    }
    function load_video {
      insmod vbe
      insmod vga
    }
    insmod part_msdos
    insmod ext2
    set root='(hd1,msdos1)'
    search --no-floppy --fs-uuid --set ca8b4eb9-696a-4117-adc6-4f9e96d2969c
    if loadfont /usr/share/grub/unicode.pf2 ; then
      set gfxmode=640x480
      load_video
      insmod gfxterm
    fi
    terminal_output gfxterm
    insmod part_msdos
    insmod ext2
    set root='(hd1,msdos1)'
    search --no-floppy --fs-uuid --set ca8b4eb9-696a-4117-adc6-4f9e96d2969c
    set locale_dir=($root)/boot/grub/locale
    set lang=en
    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, with Linux 2.6.35-22-generic' --class ubuntu --class gnu-linux --class gnu --class os {
     recordfail
     insmod part_msdos
     insmod ext2
     set root='(hd1,msdos1)'
     search --no-floppy --fs-uuid --set ca8b4eb9-696a-4117-adc6-4f9e96d2969c
     linux /boot/vmlinuz-2.6.35-22-generic root=UUID=ca8b4eb9-696a-4117-adc6-4f9e96d2969c ro   quiet splash
     initrd /boot/initrd.img-2.6.35-22-generic
    }
    menuentry 'Ubuntu, with Linux 2.6.35-22-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
     recordfail
     insmod part_msdos
     insmod ext2
     set root='(hd1,msdos1)'
     search --no-floppy --fs-uuid --set ca8b4eb9-696a-4117-adc6-4f9e96d2969c
     echo 'Loading Linux 2.6.35-22-generic ...'
     linux /boot/vmlinuz-2.6.35-22-generic root=UUID=ca8b4eb9-696a-4117-adc6-4f9e96d2969c ro single 
     echo 'Loading initial ramdisk ...'
     initrd /boot/initrd.img-2.6.35-22-generic
    }
    ### END /etc/grub.d/10_linux ###
    ### BEGIN /etc/grub.d/20_linux_xen ###
    ### END /etc/grub.d/20_linux_xen ###
    ### BEGIN /etc/grub.d/20_memtest86+ ###
    menuentry "Memory test (memtest86+)" {
     insmod part_msdos
     insmod ext2
     set root='(hd1,msdos1)'
     search --no-floppy --fs-uuid --set ca8b4eb9-696a-4117-adc6-4f9e96d2969c
     linux16 /boot/memtest86+.bin
    }
    menuentry "Memory test (memtest86+, serial console 115200)" {
     insmod part_msdos
     insmod ext2
     set root='(hd1,msdos1)'
     search --no-floppy --fs-uuid --set ca8b4eb9-696a-4117-adc6-4f9e96d2969c
     linux16 /boot/memtest86+.bin console=ttyS0,115200n8
    }
    ### END /etc/grub.d/20_memtest86+ ###
    ### BEGIN /etc/grub.d/30_os-prober ###
    menuentry "Windows Vista (loader) (on /dev/sda2)" {
     insmod part_msdos
     insmod ntfs
     set root='(hd0,msdos2)'
     search --no-floppy --fs-uuid --set 061e52481e523143
     chainloader +1
    }
    ### 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 ###
    ### BEGIN /etc/grub.d/41_custom ###
    if [ -f  $prefix/custom.cfg ]; then
      source $prefix/custom.cfg;
    fi
    ### END /etc/grub.d/41_custom ###
    =============================== sdb1/etc/fstab: ===============================
    # /etc/fstab: static file system information.
    #
    # Use 'blkid -o value -s UUID' to print the universally unique identifier
    # for a device; this may be used with UUID= as a more robust way to name
    # devices that works even if disks are added and removed. See fstab(5).
    #
    # <file system> <mount point>   <type>  <options>       <dump>  <pass>
    proc            /proc           proc    nodev,noexec,nosuid 0       0
    /dev/sdb1       /               ext4    errors=remount-ro 0       1
    /dev/sdb5       none            swap    sw              0       0
    =================== sdb1: Location of files loaded by Grub: ===================
    
     202.0GB: boot/grub/core.img
      64.6GB: boot/grub/grub.cfg
        .6GB: boot/initrd.img-2.6.35-22-generic
     202.0GB: boot/vmlinuz-2.6.35-22-generic
        .6GB: initrd.img
     202.0GB: vmlinuz
    First you need to fix your internal disk MBR to boot windows. Boot the Live CD and choose try ubuntu without external plugged in. When the desktop loads open a terminal and run
    Code:
    sudo apt-get install lilo
    Ignore warnings and continue.

    next in terminal run
    Code:
    sudo lilo -M /dev/sda mbr
    This will put a generic windows bootloader to MBR of internal disk. Reboot without Live Cd and without external plugged in. You should boot right to windows.

    Now plug the external in and boot the ubuntu Live Cd again, choose try ubuntu. When the desktop loads open a terminal and run
    Code:
    sudo mount /dev/sdb1 /mnt
    This will mount your ubuntu root partition.
    Next in terminal run
    Code:
    sudo grub-install --root-directory=/mnt/ /dev/sdb
    This will put GRUB on MBR of external disk and pointing to sdb1

    Now reboot without the Live Cd and with the external plugged in, make sure the external disk is set to boot before the internal disk in BIOS. You should get the GRUB menu.

    You are now good to go. When the external is unplugged you boot to windows, when the external is in you get GRUB
    Last edited by presence1960; January 23rd, 2011 at 08:05 PM.
    Multi-boot: Arch linux, Ubuntu 12.04, Windows 7 & Windows 8

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