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Thread: Can't reinstall grub2.

  1. #1
    Join Date
    Sep 2011
    Beans
    17

    Question Can't reinstall grub2.

    Today, my burg was freeze on loading. So im tried to reinstall grub by an Ubuntu liveCD 13.04 disk.
    by these command below:
    Code:
    sudo mount /dev/sda5 /mnt
    sudo mount --bind /dev /mnt/dev
    sudo mount --bind /proc /mnt/proc
    sudo mount --bind /sys /mnt/sys
    sudo chroot /mnt
    grub-install --boot-directory=/mnt dev/sda
    update-grub
    everything is success and then I reboot my laptop, but 'grub screen' only show me grub prompt, no menu to select.
    I try to boot to ubutnu by grub prompt:
    Code:
    set prefix=(hd0,5)/boot/grub
    set root=(hd0,5)
    set
    insmod /boot/grub/i386-pc/linux.mod
    linux /vmlinuz root=/dev/sda5 ro
    initrd /initrd.img
    boot
    oK, my ubuntu is booting up , and I reinstall grub:
    Code:
    sudo grub-install --boot-directory=/ /dev/sda
    sudo update-grub
    Code:
    grub-install -v
    grub-install (GRUB) 2.00-13ubuntu3



    everything is sussess
    But when I reboot my laptop, still grub prompt.

    Code:
    fdisk -l 
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1   *        2048   128018431    64008192    7  HPFS/NTFS/exFAT
    /dev/sda2       128021985   976768064   424373040    5  Extended
    Partition 2 does not start on physical sector boundary.
    /dev/sda5       128022048   149002874    10490413+  83  Linux
    /dev/sda6       149002938   211929479    31463271   83  Linux
    Partition 6 does not start on physical sector boundary.
    /dev/sda7       211929543   358731449    73400953+   7  HPFS/NTFS/exFAT
    Partition 7 does not start on physical sector boundary.
    /dev/sda8       358731513   685429289   163348888+   7  HPFS/NTFS/exFAT
    Partition 8 does not start on physical sector boundary.
    /dev/sda9       685429353   829966094    72268371    7  HPFS/NTFS/exFAT
    Partition 9 does not start on physical sector boundary.
    /dev/sda10      829966158   967145129    68589486    7  HPFS/NTFS/exFAT
    Partition 10 does not start on physical sector boundary.
    /dev/sda11      967145193   976768064     4811436   82  Linux swap / Solaris
    Partition 11 does not start on physical sector boundary.

    Please help me reinstall grub on my Ubuntu 13.04 x64
    OR Please help me install another grub version like
    grub2_1.99-21ubuntu3.9_amd64.deb

    from http://packages.ubuntu.com/precise-u...grub2/download
    (because grub2 on my laptop can't booting to Windows 7 , now. but burg can do.)

    thanks so much.
    Sorry, my english is very bad.
    Last edited by markdark20; May 7th, 2013 at 12:15 PM.

  2. #2
    Join Date
    Jun 2009
    Location
    SW Forida
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    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Can't reinstall grub2.

    If you can boot manually, you can do this:
    sudo grub-install /dev/sda

    sudo update-grub

    Sometimes this works better:

    #to get grub2 to remember where to reinstall on updates:
    sudo dpkg-reconfigure grub-pc
    #Enter thru first pages,spacebar to choose/unchoose drive, enter to accept, do not choose partitions

    If you still have issues, download Boot-Repair and run the BootInfo report.

    Post the link to the BootInfo report that this creates. Is part of Boot-Repair:
    https://help.ubuntu.com/community/Boot-Info
    Boot Repair -Also handles LVM, GPT, separate /boot and UEFI dual boot.:
    https://help.ubuntu.com/community/Boot-Repair
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  3. #3
    Join Date
    Jun 2010
    Location
    London, England
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    Re: Can't reinstall grub2.

    Do you understand why it failed? You updated the Grub configuration files but you did not install Grub into the MBR of sda. It is the
    Code:
    sudo grub-install /dev/sda
    that does it.

    Regards.
    It is a machine. It is more stupid than we are. It will not stop us from doing stupid things.
    Ubuntu user #33,200. Linux user #530,530


  4. #4
    Join Date
    Sep 2010
    Location
    Beta Testing in Canada
    Beans
    9,116
    Distro
    Ubuntu Development Release

    Re: Can't reinstall grub2.

    I have the grub-rescue CD and that does it every time.
    This is not Convergence, This is now Gnome
    Ubuntu Development Version Testing Blog Remarks
    Running 16.04 on Mobo: MSI model: B85-G41 PC Mate(MS-7850) v: 1.0

  5. #5
    Join Date
    Sep 2011
    Beans
    17

    Re: Can't reinstall grub2.

    Thanks you so much ^^
    I mistake here :
    sudo grub-install --boot-directory=/ /dev/sda
    code correct is
    sudo grub-install /dev/sda

    But now I have a new problem, grub2 cann't bootting correct to Windows7. It show BOOTMGR is corrupt. The system cannt boot.

    If I use Restore MBR of boot-repair tool, the system straight boots to Windows7 without grub menu.
    Ìf I use Reinstall Grub (boot-repair), grub menu cann't boot to Windows7 like I said above.
    What's I need to do to repair grub (and boot corect to W7, too) ?
    Thanks
    Last edited by markdark20; May 7th, 2013 at 04:00 AM.

  6. #6
    Join Date
    Jun 2009
    Location
    SW Forida
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    Hidden!
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Can't reinstall grub2.

    Boot-Repair will not fix Windows internal errors, It can add a Windows boot loader to the MBR. You will need your Windows repairCD or flash drive. Or some have gotten into Windows 7 repair console if booting the 100MB boot/repair, but you have to be very fast (same time) with f8 as the time from grub to Windows is a lot shorter than from MBR to Windows booting. Some said they had to try many times just to get it to work once. Probably better to have Windows repairCD or flash drive.

    BootInfo report may show some of the Windows issues. Often chkdsk is needed from Windows repairs. If you installed grub to Windows PBR Bootinfo report will show that, but you can use testdisk on a Linux live installer to fix that. Then everything else is Windows repairs.
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  7. #7
    Join Date
    Oct 2010
    Beans
    140

    Re: Can't reinstall grub2.

    grub-install --boot-directory=/boot --no-floppy --recheck --debug /dev/sda
    grub-mkconfig -o /boot/kernel-3.9.0

    reboot

    you should now be greeted with grub.
    Last edited by Rukiri; May 7th, 2013 at 05:40 AM.

  8. #8
    Join Date
    Sep 2011
    Beans
    17

    Re: Can't reinstall grub2.

    thanks
    here is my Bootinfor
    http://paste.ubuntu.com/5640543/

    I will try testdisk and report back later.

  9. #9
    Join Date
    Sep 2011
    Beans
    17

    Re: Can't reinstall grub2.

    My problem is solved.
    I use BootICE and Parted Magic to fix Windows loader and grub2.
    Thanks all ^^

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