Results 1 to 2 of 2

Thread: Oops, formatte /boot

  1. #1
    Join Date
    Mar 2007
    Location
    /US/EC/DC
    Beans
    Hidden!

    Oops, formatte /boot

    Hey all, today I attempted to add Windows XP to my current Ubuntu 8.04 installation, and I inadvertently formatted over my /boot (former sda1). Now Gparted doesn't see any partitions, and shows an unallocated space of 149.05 Gb (out of ~250 Gb) on sda. The Ubuntu install disk also doesn't see any partitions, so simply reinstalling Ubuntu wouldn't work, as I don't want to over write my /home.

    My data seems to all be there, as I can still mount all of the partitions through the LiveCD.

    Is there any way I can "rebuild" /boot?

    Here's the fstab:

    Code:
    # /etc/fstab: static file system information.
    #
    # <file system> <mount point>   <type>  <options>       <dump>  <pass>
    proc            /proc           proc    defaults        0       0
    # /dev/sda4
    UUID=c55105e6-b97e-4662-9fa0-f7895896d6c3 /               reiserfs notail,relatime 0       1
    # /dev/sda1
    UUID=0effa667-bf00-442a-8baa-8eff4b143a3e /boot           reiserfs notail,relatime 0       2
    # /dev/sda3
    UUID=53dc1bb2-8821-42ee-a4fd-2dd362173281 /home           ext3    relatime         0       2
    # /dev/sda5
    UUID=ea6a74d0-18ef-485f-8c81-292d6b604c12 none            swap    sw               0       0
    /dev/scd0       /media/cdrom0   udf,iso9660 user,noauto,exec,utf8 0       0
    And the latest backup of my menu.lst:

    Code:
    # menu.lst - See: grub(8), info grub, update-grub(8)
    #            grub-install(8), grub-floppy(8),
    #            grub-md5-crypt, /usr/share/doc/grub
    #            and /usr/share/doc/grub-doc/.
    
    ## default num
    # Set the default entry to the entry number NUM. Numbering starts from 0, and
    # the entry number 0 is the default if the command is not used.
    #
    # You can specify 'saved' instead of a number. In this case, the default entry
    # is the entry saved with the command 'savedefault'.
    # WARNING: If you are using dmraid do not use 'savedefault' or your
    # array will desync and will not let you boot your system.
    default		0
    
    ## timeout sec
    # Set a timeout, in SEC seconds, before automatically booting the default entry
    # (normally the first entry defined).
    timeout		10
    
    ## hiddenmenu
    # Hides the menu by default (press ESC to see the menu)
    #hiddenmenu
    
    # Pretty colours
    #color cyan/blue white/blue
    
    ## password ['--md5'] passwd
    # If used in the first section of a menu file, disable all interactive editing
    # control (menu entry editor and command-line)  and entries protected by the
    # command 'lock'
    # e.g. password topsecret
    #      password --md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/
    # password topsecret
    
    #
    # examples
    #
    # title		Windows 95/98/NT/2000
    # root		(hd0,0)
    # makeactive
    # chainloader	+1
    #
    # title		Linux
    # root		(hd0,1)
    # kernel	/vmlinuz root=/dev/hda2 ro
    #
    
    #
    # Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST
    
    ### BEGIN AUTOMAGIC KERNELS LIST
    ## lines between the AUTOMAGIC KERNELS LIST markers will be modified
    ## by the debian update-grub script except for the default options below
    
    ## DO NOT UNCOMMENT THEM, Just edit them to your needs
    
    ## ## Start Default Options ##
    ## default kernel options
    ## default kernel options for automagic boot options
    ## If you want special options for specific kernels use kopt_x_y_z
    ## where x.y.z is kernel version. Minor versions can be omitted.
    ## e.g. kopt=root=/dev/hda1 ro
    ##      kopt_2_6_8=root=/dev/hdc1 ro
    ##      kopt_2_6_8_2_686=root=/dev/hdc2 ro
    # kopt=root=UUID=c55105e6-b97e-4662-9fa0-f7895896d6c3 ro
    
    ## Setup crashdump menu entries
    ## e.g. crashdump=1
    # crashdump=0
    
    ## default grub root device
    ## e.g. groot=(hd0,0)
    # groot=(hd0,0)
    
    ## should update-grub create alternative automagic boot options
    ## e.g. alternative=true
    ##      alternative=false
    # alternative=true
    
    ## should update-grub lock alternative automagic boot options
    ## e.g. lockalternative=true
    ##      lockalternative=false
    # lockalternative=false
    
    ## additional options to use with the default boot option, but not with the
    ## alternatives
    ## e.g. defoptions=vga=791 resume=/dev/hda5
    # defoptions=quiet splash
    
    ## should update-grub lock old automagic boot options
    ## e.g. lockold=false
    ##      lockold=true
    # lockold=false
    
    ## Xen hypervisor options to use with the default Xen boot option
    # xenhopt=
    
    ## Xen Linux kernel options to use with the default Xen boot option
    # xenkopt=console=tty0
    
    ## altoption boot targets option
    ## multiple altoptions lines are allowed
    ## e.g. altoptions=(extra menu suffix) extra boot options
    ##      altoptions=(recovery) single
    # altoptions=(recovery mode) single
    
    ## controls how many kernels should be put into the menu.lst
    ## only counts the first occurence of a kernel, not the
    ## alternative kernel options
    ## e.g. howmany=all
    ##      howmany=7
    # howmany=all
    
    ## should update-grub create memtest86 boot option
    ## e.g. memtest86=true
    ##      memtest86=false
    # memtest86=true
    
    ## should update-grub adjust the value of the default booted system
    ## can be true or false
    # updatedefaultentry=false
    
    ## should update-grub add savedefault to the default options
    ## can be true or false
    # savedefault=false
    
    ## ## End Default Options ##
    
    
    
    #title		Ubuntu 8.04, kernel 2.6.25.9-ultimate
    #root		(hd0,0)
    #kernel		/vmlinuz-2.6.25.9-ultimate root=UUID=c55105e6-b97e-4662-9fa0-f7895896d6c3 ro quiet splash
    #initrd		/initrd.img-2.6.25.9-ultimate
    #quiet
    
    #title		Ubuntu 8.04, kernel 2.6.25.9-ultimate (recovery mode)
    #root		(hd0,0)
    #kernel		/vmlinuz-2.6.25.9-ultimate root=UUID=c55105e6-b97e-4662-9fa0-f7895896d6c3 ro single
    #initrd		/initrd.img-2.6.25.9-ultimate
    
    title		Ubuntu 8.04, kernel 2.6.24-19-generic
    root		(hd0,0)
    kernel		/vmlinuz-2.6.24-19-generic root=UUID=c55105e6-b97e-4662-9fa0-f7895896d6c3 ro quiet splash
    initrd		/initrd.img-2.6.24-19-generic
    quiet
    
    title		Ubuntu 8.04, kernel 2.6.24-19-generic (recovery mode)
    root		(hd0,0)
    kernel		/vmlinuz-2.6.24-19-generic root=UUID=c55105e6-b97e-4662-9fa0-f7895896d6c3 ro single
    initrd		/initrd.img-2.6.24-19-generic
    
    title		Ubuntu 8.04, kernel 2.6.24-16-generic
    root		(hd0,0)
    kernel		/vmlinuz-2.6.24-16-generic root=UUID=c55105e6-b97e-4662-9fa0-f7895896d6c3 ro quiet splash
    initrd		/initrd.img-2.6.24-16-generic
    quiet
    
    title		Ubuntu 8.04, kernel 2.6.24-16-generic (recovery mode)
    root		(hd0,0)
    kernel		/vmlinuz-2.6.24-16-generic root=UUID=c55105e6-b97e-4662-9fa0-f7895896d6c3 ro single
    initrd		/initrd.img-2.6.24-16-generic
    
    title		Ubuntu 8.04, memtest86+
    root		(hd0,0)
    kernel		/memtest86+.bin
    quiet
    
    ### END DEBIAN AUTOMAGIC KERNELS LIST
    Both of these files are inside of my current Ubuntu install partitions. fstab is in my / partition, and the menu.lst is a backup in my /home.
    Last edited by SkonesMickLoud; July 6th, 2008 at 02:09 AM.

  2. #2
    Join Date
    Jun 2006
    Beans
    7,419
    Distro
    Ubuntu 8.04 Hardy Heron

    Re: Oops, formatte /boot

    You're going to have to use TestDisk from the ubuntu live cd to fix the partition table. Then run grub-install.

    >system>admin>software sources>enable universe repository

    sudo apt-get install testdisk

    sudo testdisk

    Read the documentation here and here.

    When finished, use Gparted to re-format as reiserfs.

    Then, remount / and /boot:

    sudo mkdir /media/sda4
    sudo mount -t ext3 /dev/sda4 /media/sda4
    sudo mount -t reiserfs /dev/sda1 /media/sda4/boot
    sudo mount --bind /dev /media/sda4/dev
    sudo chroot /media/sda4
    sudo grub-install --root-directory=/boot /dev/sda1
    (or maybe just 'sudo grub-install /dev/sda1')
    sudo update-grub

    Hope that works, though TBH never tried it exactly like that (with separate /boot mounted in /) from the live cd.
    Last edited by logos34; July 7th, 2008 at 10:21 PM.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •