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I upgraded from 12.04 to 12.10 and got some error messages from grub. Now grub seems to be broken and my system no longer reboots. I have tried to boot from LiveCD and use boot-repair, but it gets stuck at "scanning your system".

I also have tried to manually install grub from terminal, using grub-install, but I get the error

/usr/sbin/grub-bios-setup: warning: File system `ext2' doesn't support embedding.
/usr/sbin/grub-bios-setup: warning: Embedding is not possible.  GRUB can only be installed in this setup by using blocklists.  However, blocklists are UNRELIABLE and their use is discouraged..
/usr/sbin/grub-bios-setup: error: will not proceed with blocklists.

Here is my fdisk -l and blkid output

ubuntu@ubuntu:~$ sudo fdisk -l
Warning: ignoring extra data in partition table 5
Warning: invalid flag 0x0000 of partition table 5 will be corrected by w(rite)

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: 0xe4f036a2

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1              63       80324       40131   de  Dell Utility
/dev/sda2   *       81920    27869183    13893632    7  HPFS/NTFS/exFAT
/dev/sda3        27869184   134610943    53370880    7  HPFS/NTFS/exFAT
/dev/sda4       134610944  3907039231  1886214144    5  Extended
/dev/sda5   ?  2371470378  3316255023   472392323    b  W95 FAT32

Disk /dev/sdb: 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: 0x0a0b0000

Disk /dev/sdb doesn't contain a valid partition table

Disk /dev/mapper/isw_ecdiigghjb_ARRAY1: 2000.4 GB, 2000405397504 bytes
255 heads, 63 sectors/track, 243202 cylinders, total 3907041792 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 131072 bytes / 262144 bytes
Disk identifier: 0xe4f036a2

                             Device Boot      Start         End      Blocks   Id  System
/dev/mapper/isw_ecdiigghjb_ARRAY1p1              63       80324       40131   de  Dell Utility
Partition 1 does not start on physical sector boundary.
/dev/mapper/isw_ecdiigghjb_ARRAY1p2   *       81920    27869183    13893632    7  HPFS/NTFS/exFAT
/dev/mapper/isw_ecdiigghjb_ARRAY1p3        27869184   134610943    53370880    7  HPFS/NTFS/exFAT
/dev/mapper/isw_ecdiigghjb_ARRAY1p4       134610944  3907039231  1886214144    5  Extended
/dev/mapper/isw_ecdiigghjb_ARRAY1p5      1977811456  2009060863    15624704   82  Linux swap / Solaris
/dev/mapper/isw_ecdiigghjb_ARRAY1p6      2009061376  3907039231   948988928   83  Linux
/dev/mapper/isw_ecdiigghjb_ARRAY1p7       134612992  1977810943   921598976   83  Linux

Partition table entries are not in disk order

Disk /dev/mapper/isw_ecdiigghjb_ARRAY1p1: 41 MB, 41094144 bytes
255 heads, 63 sectors/track, 4 cylinders, total 80262 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 131072 bytes / 262144 bytes
Alignment offset: 98816 bytes
Disk identifier: 0x8a42b4c3

This doesn't look like a partition table
Probably you selected the wrong device.

                               Device Boot      Start         End      Blocks   Id  System
/dev/mapper/isw_ecdiigghjb_ARRAY1p1p1        30195395  1796312749   883058677+  cd  Unknown
Partition 1 does not start on physical sector boundary.
/dev/mapper/isw_ecdiigghjb_ARRAY1p1p2   ?   544165376  2228272491   842053558   72  Unknown
Partition 2 does not start on physical sector boundary.
/dev/mapper/isw_ecdiigghjb_ARRAY1p1p3   ?  1109413705  1109433745       10020+  45  Unknown
Partition 3 does not start on physical sector boundary.

Disk /dev/mapper/isw_ecdiigghjb_ARRAY1p2: 14.2 GB, 14227079168 bytes
255 heads, 63 sectors/track, 1729 cylinders, total 27787264 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 131072 bytes / 262144 bytes
Disk identifier: 0x6e697373

This doesn't look like a partition table
Probably you selected the wrong device.

                               Device Boot      Start         End      Blocks   Id  System
/dev/mapper/isw_ecdiigghjb_ARRAY1p2p1   ?  1936269394  3772285809   918008208   4f  QNX4.x 3rd part
Partition 1 does not start on physical sector boundary.
/dev/mapper/isw_ecdiigghjb_ARRAY1p2p2   ?  1917848077  2462285169   272218546+  73  Unknown
Partition 2 does not start on physical sector boundary.
/dev/mapper/isw_ecdiigghjb_ARRAY1p2p3   ?  1818575915  2362751050   272087568   2b  Unknown
Partition 3 does not start on physical sector boundary.
/dev/mapper/isw_ecdiigghjb_ARRAY1p2p4   ?  2844547410  2844602383       27487   43  Unknown
Partition 4 does not start on physical sector boundary.

Partition table entries are not in disk order

Disk /dev/mapper/isw_ecdiigghjb_ARRAY1p3: 54.7 GB, 54651781120 bytes
255 heads, 63 sectors/track, 6644 cylinders, total 106741760 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 131072 bytes / 262144 bytes
Disk identifier: 0x6e697373

This doesn't look like a partition table
Probably you selected the wrong device.

                               Device Boot      Start         End      Blocks   Id  System
/dev/mapper/isw_ecdiigghjb_ARRAY1p3p1   ?  1936269394  3772285809   918008208   4f  QNX4.x 3rd part
Partition 1 does not start on physical sector boundary.
/dev/mapper/isw_ecdiigghjb_ARRAY1p3p2   ?  1917848077  2462285169   272218546+  73  Unknown
Partition 2 does not start on physical sector boundary.
/dev/mapper/isw_ecdiigghjb_ARRAY1p3p3   ?  1818575915  2362751050   272087568   2b  Unknown
Partition 3 does not start on physical sector boundary.
/dev/mapper/isw_ecdiigghjb_ARRAY1p3p4   ?  2844524554  2844579527       27487   61  SpeedStor
Partition 4 does not start on physical sector boundary.

Partition table entries are not in disk order
omitting empty partition (6)

Disk /dev/mapper/isw_ecdiigghjb_ARRAY1p4: 1931.5 GB, 1931483283456 bytes
255 heads, 63 sectors/track, 234822 cylinders, total 3772428288 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 131072 bytes / 262144 bytes
Disk identifier: 0x00000000

                               Device Boot      Start         End      Blocks   Id  System
/dev/mapper/isw_ecdiigghjb_ARRAY1p4p1      1843200512  1874449919    15624704   82  Linux swap / Solaris
/dev/mapper/isw_ecdiigghjb_ARRAY1p4p2      1874449920  3772428287   948989184    5  Extended
/dev/mapper/isw_ecdiigghjb_ARRAY1p4p5      1874450432  3772428287   948988928   83  Linux

Disk /dev/mapper/isw_ecdiigghjb_ARRAY1p5: 16.0 GB, 15999696896 bytes
255 heads, 63 sectors/track, 1945 cylinders, total 31249408 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 131072 bytes / 262144 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/isw_ecdiigghjb_ARRAY1p5 doesn't contain a valid partition table

Disk /dev/mapper/isw_ecdiigghjb_ARRAY1p6: 971.8 GB, 971764662272 bytes
255 heads, 63 sectors/track, 118143 cylinders, total 1897977856 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 131072 bytes / 262144 bytes
Disk identifier: 0x00000000

                               Device Boot      Start         End      Blocks   Id  System

Disk /dev/mapper/isw_ecdiigghjb_ARRAY1p7: 943.7 GB, 943717351424 bytes
255 heads, 63 sectors/track, 114733 cylinders, total 1843197952 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 131072 bytes / 262144 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/isw_ecdiigghjb_ARRAY1p7 doesn't contain a valid partition table

Disk /dev/sdc: 7803 MB, 7803174912 bytes
122 heads, 58 sectors/track, 2153 cylinders, total 15240576 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: 0x000a52ba

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1   *        8064    15240575     7616256    c  W95 FAT32 (LBA)


ubuntu@ubuntu:~$ sudo blkid
/dev/loop0: TYPE="squashfs" 
/dev/loop1: UUID="a944e968-8704-4ecb-9038-97c530105112" TYPE="ext3" 
/dev/sda: TYPE="isw_raid_member" 
/dev/sdb: TYPE="isw_raid_member" 
/dev/mapper/isw_ecdiigghjb_ARRAY1p1: SEC_TYPE="msdos" LABEL="DellUtility" UUID="5450-4444" TYPE="vfat" 
/dev/mapper/isw_ecdiigghjb_ARRAY1p2: LABEL="RECOVERY" UUID="E248A79748A768CD" TYPE="ntfs" 
/dev/mapper/isw_ecdiigghjb_ARRAY1p3: LABEL="OS" UUID="82A2AD4BA2AD448F" TYPE="ntfs" 
/dev/mapper/isw_ecdiigghjb_ARRAY1p5: UUID="8a6c1f9b-fc18-498f-a34b-3dec9ae6b7f7" TYPE="swap" 
/dev/mapper/isw_ecdiigghjb_ARRAY1p6: UUID="34366f2c-1e40-4719-9762-22bb46e3d8bf" TYPE="ext4" 
/dev/mapper/isw_ecdiigghjb_ARRAY1p7: LABEL="backup" UUID="50cb5127-f9fc-4e4f-8a1d-dc313653e66c" TYPE="ext4" 
/dev/sdc1: LABEL="KINGSTON" UUID="EA1D-6067" TYPE="vfat" 

I know there is something very wrong with my partitions, but I can not afford to make a clean install and loose the data. Also it is not possible to do a backup at this point. Any help will be greatly appreciated!

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You can backup your files using a live cd. –  Thomas15v Apr 16 '13 at 15:37
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