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Thread: confused chrooter in waiting looking to grub install from liveDVD

  1. #1
    Join Date
    Mar 2007
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    confused chrooter in waiting looking to grub install from liveDVD

    I'm eventually looking to repair my grub using a liveDVD. I'm really confused with my partitions when it comes to attempting to chroot the system first.

    when i
    sudo fdisk -l
    I get the following:

    Code:
    WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.
    
    
    Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
    255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x000537dc
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1   *          63    98060759    49030348+  82  Linux swap / Solaris
    /dev/sda2        98060760  1953520064   927729652+   5  Extended
    /dev/sda5        98060823  1953520064   927729621   83  Linux
    
    Disk /dev/mapper/nvidia_cbddiijb: 1000.2 GB, 1000204884992 bytes
    255 heads, 63 sectors/track, 121601 cylinders, total 1953525166 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x000537dc
    
                          Device Boot      Start         End      Blocks   Id  System
    /dev/mapper/nvidia_cbddiijb1   *          63    98060759    49030348+  82  Linux swap / Solaris
    /dev/mapper/nvidia_cbddiijb2        98060760  1953520064   927729652+   5  Extended
    /dev/mapper/nvidia_cbddiijb5        98060823  1953520064   927729621   83  Linux
    
    Disk /dev/mapper/nvidia_cbddiijb2: 950.0 GB, 949995164160 bytes
    255 heads, 63 sectors/track, 115497 cylinders, total 1855459305 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00000000
    
                            Device Boot      Start         End      Blocks   Id  System
    /dev/mapper/nvidia_cbddiijb2p1              63  1855459304   927729621   83  Linux
    
    Disk /dev/mapper/nvidia_cbddiijb5: 950.0 GB, 949995131904 bytes
    255 heads, 63 sectors/track, 115496 cylinders, total 1855459242 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00000000
    
    Disk /dev/mapper/nvidia_cbddiijb5 doesn't contain a valid partition table
    
    Disk /dev/mapper/nvidia_cbddiijb1: 50.2 GB, 50207076864 bytes
    255 heads, 63 sectors/track, 6103 cylinders, total 98060697 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00000000
    
    Disk /dev/mapper/nvidia_cbddiijb1 doesn't contain a valid partition table
    I took this to mean that i could try either:

    Code:
    mount /dev/sda5 /mnt/
    or
    Code:
    mount /dev/mapper/nvidia_cbddiijb5
    but whenever i try either i get

    Code:
    mount: special device /dev/nvidia_cbddiijb5 does not exist
    Could someone please try and explain what is going on here and what i'm doing wrong
    Last edited by javaholic; April 15th, 2012 at 01:54 PM. Reason: mistakes

  2. #2
    Join Date
    Jun 2009
    Location
    Chicago Suburbs
    Beans
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    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: confused chrooter in waiting looking to grub install from liveDVD

    Are you running RAID or LVM? The mapper is only showing sdb not sda. I do not know RAID so I cannot really help on that.

    But with gpt and booting with BIOS (not UEFI) you need a small 1MB bios_grub partition to get grub to correctly install. It can be anywhere on drive.

    If using gpt with BIOS create a 1MB bios_grub partition with no format. I used gparted and selected gpt under device, advanced & select gpt over msdos(MBR) default partitioning.... But if you are using RAID you cannot use gparted but have to use whatever mdadm?

    All the normal reinstall or chroot instructions I have are for standard partitions, you have to translate to use the RAID/mapper partitions.

    Reinstall grub2 - Short version & full chroot version
    https://help.ubuntu.com/community/Gr...alling%20GRUB2
    Grub2 info & full chroot version - also see METHOD 3 - CHROOT:
    https://wiki.ubuntu.com/Grub2#Recove...20via%20LiveCD
    Oldfred on vacation. Back Sept 9. Will not have much if any Internet access.
    For info on UEFI boot install & repair:
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to close thread when/if answered completely.







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