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Thread: HOWTO: Restore GRUB (if your MBR is messed up)

  1. #171
    Join Date
    Aug 2007
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    rarehero.com
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    51
    Distro
    Ubuntu

    Re: HOWTO: Restore GRUB (if your MBR is messed up)

    Quote Originally Posted by vnbuddy2002 View Post
    Restore GRUB quite simple in Ubuntu, instead going through all the "gain root access" and play with shell commands, you can use the Ubuntu installation CD to restore it without going through all kinds of hassles.

    Here are the steps:

    1. Boot your computer up with Ubunto CD
    2. Go through all the process until you reech "[!!!] Disk Partition"
    3. Select Manual Partition
    4. Mount your appropriate linux partions

    /
    /boot
    swap
    .....

    5. DO NOT FORMAT THEM.
    6. Finish the manual partition
    7. Say "Yes" when it asks you to save the changes
    8. It will give you errors saying that "the system couldn't install ....." after that
    9. Ignore them, keep select "continue" until you get back to the Ubuntu installation menu
    10. Jump to "Install Grub ...."
    11. Once it is finished, just restart your computer

    Good luck!.
    Doesn't work.
    after step 5 i get this:
    The file system on /dev/hdb1 assigned to / has not been marked for formatting. File systems used by the system (/, /boot, /usr, /var) must be reformatted for use by this installer. Other file systems (/home, /media/*, /usr/local, etc.) may be used without reformatting.
    Won't allow me to continue.
    rare HERO BLOG

  2. #172
    Join Date
    Aug 2007
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    rarehero.com
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    Distro
    Ubuntu

    Re: HOWTO: Restore GRUB (if your MBR is messed up)

    Quote Originally Posted by Tomy View Post
    From the grub prompt trying using the <tab> key to see what choices you have.

    grub> root (<tab>

    Tomy
    I get this:
    grub> root
    Error 1: Filename must be either an absolute pathname or blocklist
    rare HERO BLOG

  3. #173
    Join Date
    May 2007
    Beans
    59

    Re: HOWTO: Restore GRUB (if your MBR is messed up)

    Phew, this is a long thread...

    Haven't read the lot so someone else may have pointed out some of this.

    Have a look at

    http://linuxmint.com/wiki/index.php/...pair_your_grub

    Try supergrub it may help
    http://supergrub.forjamari.linex.org/

    The next alternative to a complete re-installation is the Ultimate Boot CD (UBCD). There's both a Linux version and a Windows version. Both can be useful if only to allow access to files. http://www.ultimatebootcd.com/download.html

    The last thing I would try is to install on another partition, sometimes this will fix the issues, and at least, will give access (possible access) to files on the system.

    I've done all the above in the past. When using SuperGrub, when you edit the "root" drive pointer details remember that you can alter the drive numbering more than once i.e if you change it and it doesn't work, change it again until you find the right drive details. Try hd0,0 or hd0,1 or hd0,2 or hd1,0 or hd1,1 or hd1,2 and so forth.

    If I've helped, drop me a thank you because I often post my solutions to problems I've had; and without feedback, I don't know how well I've helped others. No feedback, no more help.

    As a side note, set aside a separate drive (not partition) for all personal documents. I used to do this in Windows and I've taken this to Linux too. Remember that the "home" directory is only small (few GB) and is designed to make it easy for us to back-up our personal settings. Just copy and paste it somewhere safe (like a DVD) and when you need to back-up your system, copy and paste it back!

    Regards,
    UltraGeeky

  4. #174
    Join Date
    Apr 2008
    Beans
    1

    Re: HOWTO: Restore GRUB (if your MBR is messed up)

    Quote Originally Posted by remmelt View Post
    Isn't it easier to do this:

    1. Pop in the Live CD, boot from it until you reach the desktop.
    2. Open a terminal window or switch to a tty.
    3. Type "grub"
    4. Type "root (hd0,6)", or whatever your harddisk + boot partition numbers are (my /boot is at /dev/sda7, which translates to hd0,6 for grub).
    5. Type "setup (hd0)", ot whatever your harddisk nr is.
    6. Quit grub by typing "quit".
    7. Reboot.

    I may be missing your point though, if so, please forgive me
    Hi,

    I've reinstalled a WinXP and naturally my grub doesn't work anymore.
    I've applied this method to restore the grub, with the following specific parameters:

    1. livecd
    2. terminal
    3.
    Code:
    sudo grub
    In the grub terminal:
    4.
    Code:
    find /boot/grub/stage1
    It returned
    Code:
    (hd0,5)
    5.
    Code:
    root (hd0,5)
    6.
    Code:
    setup (hd0)
    At this point, the grub terminal displays this:

    Code:
    Checking if "/boot/grub/stage1" exists... yes
    Checking if "/boot/grub/stage2" exists... yes
    Checking if "/boot/grub/e2fs_stage1_5" exists... yes
    Running "embed /boot/grub/e2fs_stage1_5 (hd0)"...  15 sectors are embedded.
    succeeded
    Running "install /boot/grub/stage1 (hd0) (hd0)1+15 p (hd0,5)/boot/grub/stage2
    /boot/grub/menu.lst"... failed
    
    Error 12: Invalid device requested
    Any help will be much appreciated!

  5. #175
    Join Date
    Apr 2006
    Beans
    132

    Re: HOWTO: Restore GRUB (if your MBR is messed up)

    Maybe i did something wrong, but i tried to reinstall grub with the hardy live cd as advised in this howto and ruined my install.

    I did chose not to format in the partitioner, but it started installing without formating in my root partition and screwed up my install. It was a fresh install so there was no data loss, but it still sucks to do another install.

    I am afraid this howto is outdated

  6. #176
    Join Date
    Jan 2007
    Location
    Estado Luzsolar
    Beans
    101
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: HOWTO: Restore GRUB (if your MBR is messed up)

    Try Super Grub Disk . I used the 0.9588 version just yesterday and

    it worked very easily and quickly .
    Triple Boot : 10.10 ,Mint 8 , win xp

  7. #177
    Join Date
    Apr 2008
    Beans
    5

    Re: HOWTO: Restore GRUB (if your MBR is messed up)

    I load the 8.04 desktop iso image from my hard disk
    It is just another install process,
    I don't know how to get to the desktop.

    I have 2 alternatives:
    one is Install the grub4dos on windows and then copy the entry of loading
    Unbuntu and then paste in the menu.lst file in your windows system drive
    The other one is :
    when booting ,choose the grub entry
    and then choose the:
    find and load linux with menu.lst installed

    This way you can load Ubuntu
    It works fine for me.

    The original menu.lst on your /boot/grub dir may like this:
    title Ubuntu 7.10, kernel 2.6.22-14-generic
    root (hd0,6)
    kernel /boot/vmlinuz-2.6.22-14-generic
    root=UUID=c79d0c09-5538-43ac-8a16-b17a2e114809 ro quiet splash
    initrd /boot/initrd.img-2.6.22-14-generic
    quiet

    title Ubuntu 7.10, kernel 2.6.22-14-generic (recovery mode)
    root (hd0,6)
    kernel /boot/vmlinuz-2.6.22-14-generic
    root=UUID=c79d0c09-5538-43ac-8a16-b17a2e114809 ro single
    initrd /boot/initrd.img-2.6.22-14-generic

    title Ubuntu 7.10, memtest86+
    root (hd0,6)
    kernel /boot/memtest86+.bin
    quiet

  8. #178
    Join Date
    Jun 2006
    Beans
    3

    Re: HOWTO: Restore GRUB (if your MBR is messed up)

    I apologize if this link was posted earlier - I haven't read through this entire thread. In any case, I struggled with this Grub problem after resizing my Ubuntu partitions until I found this link:

    http://www.linuxforums.org/forum/ubu...ub-gone-2.html

    Worked perfectly for me...

  9. #179
    Join Date
    Apr 2008
    Location
    Southern California, USA
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    Re: HOWTO: Restore GRUB (if your MBR is messed up)

    Quote Originally Posted by mikh View Post
    Hi,

    I've reinstalled a WinXP and naturally my grub doesn't work anymore.
    I've applied this method to restore the grub, with the following specific parameters:

    1. livecd
    2. terminal
    3.
    Code:
    sudo grub
    In the grub terminal:
    4.
    Code:
    find /boot/grub/stage1
    It returned
    Code:
    (hd0,5)
    5.
    Code:
    root (hd0,5)
    6.
    Code:
    setup (hd0)
    At this point, the grub terminal displays this:

    Code:
    Checking if "/boot/grub/stage1" exists... yes
    Checking if "/boot/grub/stage2" exists... yes
    Checking if "/boot/grub/e2fs_stage1_5" exists... yes
    Running "embed /boot/grub/e2fs_stage1_5 (hd0)"...  15 sectors are embedded.
    succeeded
    Running "install /boot/grub/stage1 (hd0) (hd0)1+15 p (hd0,5)/boot/grub/stage2
    /boot/grub/menu.lst"... failed
    
    Error 12: Invalid device requested
    Any help will be much appreciated!
    I think if root returned root (hd0,5), then setup should be setup (hd6) and not setup (hd0)

  10. #180
    Join Date
    Jun 2007
    Location
    Colombia
    Beans
    84
    Distro
    Ubuntu 8.10 Intrepid Ibex

    Re: HOWTO: Restore GRUB (if your MBR is messed up)

    Quote Originally Posted by VMC View Post
    I think if root returned root (hd0,5), then setup should be setup (hd6) and not setup (hd0)
    LOL I have exactly the same problem!!!!! Anyone knows what's going on here????

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