On Thu, 2011-01-27 at 15:52 +0000, Colin Watson wrote: 
> Could you add -vv to that command line and post the output, please?

Sure:

$ sudo /usr/sbin/grub-probe -vv --device /dev/mapper/rootvol_tmp-ubuntu_root 
--target=abstraction
/build/buildd/grub2-1.98/disk/raid.c:625: Scanning for RAID devices on disk hd0
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd0'...
/usr/sbin/grub-probe: info: the size of hd0 is 30023280.
/build/buildd/grub2-1.98/util/hostdisk.c:514: opening the device `/dev/sda' in 
open_device()
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `hd0'.
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd0'...
/usr/sbin/grub-probe: info: the size of hd0 is 30023280.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_gpt...
/build/buildd/grub2-1.98/util/hostdisk.c:514: opening the device `/dev/sda' in 
open_device()
/build/buildd/grub2-1.98/kern/partition.c:112: part_gpt detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_sun...
/build/buildd/grub2-1.98/kern/partition.c:112: part_sun detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_apple...
/build/buildd/grub2-1.98/partmap/apple.c:126: bad magic (found 0xeb63; wanted 
0x4552
/build/buildd/grub2-1.98/kern/partition.c:112: part_apple detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_msdos...
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 0: flag 0x80, type 
0x83, start 0x3f, len 0x2fba1
/build/buildd/grub2-1.98/kern/partition.c:117: part_msdos detection succeeded.
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 0: flag 0x80, type 
0x83, start 0x3f, len 0x2fba1
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 1: flag 0x0, type 0x8e, 
start 0x2fbe0, len 0x1c72290
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 2: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 3: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `hd0'.
/build/buildd/grub2-1.98/disk/raid.c:625: Scanning for RAID devices on disk 
hd0,2
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd0,2'...
/usr/sbin/grub-probe: info: the size of hd0 is 30023280.
/build/buildd/grub2-1.98/partmap/apple.c:126: bad magic (found 0xeb63; wanted 
0x4552
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 0: flag 0x80, type 
0x83, start 0x3f, len 0x2fba1
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 1: flag 0x0, type 0x8e, 
start 0x2fbe0, len 0x1c72290
/build/buildd/grub2-1.98/util/hostdisk.c:514: opening the device `/dev/sda2' in 
open_device()
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `hd0,2'.
/build/buildd/grub2-1.98/disk/raid.c:625: Scanning for RAID devices on disk 
hd0,1
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd0,1'...
/usr/sbin/grub-probe: info: the size of hd0 is 30023280.
/build/buildd/grub2-1.98/partmap/apple.c:126: bad magic (found 0xeb63; wanted 
0x4552
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 0: flag 0x80, type 
0x83, start 0x3f, len 0x2fba1
/build/buildd/grub2-1.98/util/hostdisk.c:514: opening the device `/dev/sda1' in 
open_device()
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda1'
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `hd0,1'.
/build/buildd/grub2-1.98/disk/raid.c:625: Scanning for RAID devices on disk hd1
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd1'...
/usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
/build/buildd/grub2-1.98/util/hostdisk.c:514: opening the device `/dev/sdb' in 
open_device()
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `hd1'.
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd1'...
/usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_gpt...
/build/buildd/grub2-1.98/util/hostdisk.c:514: opening the device `/dev/sdb' in 
open_device()
/build/buildd/grub2-1.98/kern/partition.c:112: part_gpt detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_sun...
/build/buildd/grub2-1.98/kern/partition.c:112: part_sun detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_apple...
/build/buildd/grub2-1.98/partmap/apple.c:126: bad magic (found 0xfaeb; wanted 
0x4552
/build/buildd/grub2-1.98/kern/partition.c:112: part_apple detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_msdos...
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 0: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 1: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 2: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 3: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/kern/partition.c:117: part_msdos detection succeeded.
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 0: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 1: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 2: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 3: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `hd1'.
/build/buildd/grub2-1.98/disk/raid.c:625: Scanning for RAID devices on disk hd2
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd2'...
/usr/sbin/grub-probe: info: the size of hd2 is 976773168.
/build/buildd/grub2-1.98/util/hostdisk.c:514: opening the device `/dev/sdc' in 
open_device()
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `hd2'.
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd2'...
/usr/sbin/grub-probe: info: the size of hd2 is 976773168.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_gpt...
/build/buildd/grub2-1.98/util/hostdisk.c:514: opening the device `/dev/sdc' in 
open_device()
/build/buildd/grub2-1.98/kern/partition.c:112: part_gpt detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_sun...
/build/buildd/grub2-1.98/kern/partition.c:112: part_sun detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_apple...
/build/buildd/grub2-1.98/partmap/apple.c:126: bad magic (found 0x0; wanted 
0x4552
/build/buildd/grub2-1.98/kern/partition.c:112: part_apple detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_msdos...
/build/buildd/grub2-1.98/kern/partition.c:112: part_msdos detection failed.
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `hd2'.
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd0'...
/usr/sbin/grub-probe: info: the size of hd0 is 30023280.
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `hd0'.
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd0'...
/usr/sbin/grub-probe: info: the size of hd0 is 30023280.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_gpt...
/build/buildd/grub2-1.98/kern/partition.c:112: part_gpt detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_sun...
/build/buildd/grub2-1.98/kern/partition.c:112: part_sun detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_apple...
/build/buildd/grub2-1.98/partmap/apple.c:126: bad magic (found 0xeb63; wanted 
0x4552
/build/buildd/grub2-1.98/kern/partition.c:112: part_apple detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_msdos...
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 0: flag 0x80, type 
0x83, start 0x3f, len 0x2fba1
/build/buildd/grub2-1.98/kern/partition.c:117: part_msdos detection succeeded.
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 0: flag 0x80, type 
0x83, start 0x3f, len 0x2fba1
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 1: flag 0x0, type 0x8e, 
start 0x2fbe0, len 0x1c72290
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 2: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 3: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `hd0'.
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd0,2'...
/usr/sbin/grub-probe: info: the size of hd0 is 30023280.
/build/buildd/grub2-1.98/partmap/apple.c:126: bad magic (found 0xeb63; wanted 
0x4552
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 0: flag 0x80, type 
0x83, start 0x3f, len 0x2fba1
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 1: flag 0x0, type 0x8e, 
start 0x2fbe0, len 0x1c72290
/build/buildd/grub2-1.98/util/hostdisk.c:514: opening the device `/dev/sda2' in 
open_device()
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda2'
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `hd0,2'.
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd0,1'...
/usr/sbin/grub-probe: info: the size of hd0 is 30023280.
/build/buildd/grub2-1.98/partmap/apple.c:126: bad magic (found 0xeb63; wanted 
0x4552
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 0: flag 0x80, type 
0x83, start 0x3f, len 0x2fba1
/build/buildd/grub2-1.98/util/hostdisk.c:514: opening the device `/dev/sda' in 
open_device()
/build/buildd/grub2-1.98/util/hostdisk.c:514: opening the device `/dev/sda1' in 
open_device()
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sda1'
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `hd0,1'.
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd1'...
/usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
/build/buildd/grub2-1.98/util/hostdisk.c:514: opening the device `/dev/sdb' in 
open_device()
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/util/hostdisk.c:504: reusing open device `/dev/sdb'
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd1'...
/usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `hd1'.
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd1'...
/usr/sbin/grub-probe: info: the size of hd1 is 1953525168.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_gpt...
/build/buildd/grub2-1.98/kern/partition.c:112: part_gpt detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_sun...
/build/buildd/grub2-1.98/kern/partition.c:112: part_sun detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_apple...
/build/buildd/grub2-1.98/partmap/apple.c:126: bad magic (found 0xfaeb; wanted 
0x4552
/build/buildd/grub2-1.98/kern/partition.c:112: part_apple detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_msdos...
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 0: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 1: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 2: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 3: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/kern/partition.c:117: part_msdos detection succeeded.
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 0: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 1: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 2: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/partmap/msdos.c:161: partition 3: flag 0x0, type 0x0, 
start 0x0, len 0x0
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `hd1'.
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd2'...
/usr/sbin/grub-probe: info: the size of hd2 is 976773168.
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `hd2'.
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `hd2'...
/usr/sbin/grub-probe: info: the size of hd2 is 976773168.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_gpt...
/build/buildd/grub2-1.98/kern/partition.c:112: part_gpt detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_sun...
/build/buildd/grub2-1.98/kern/partition.c:112: part_sun detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_apple...
/build/buildd/grub2-1.98/partmap/apple.c:126: bad magic (found 0x0; wanted 
0x4552
/build/buildd/grub2-1.98/kern/partition.c:112: part_apple detection failed.
/build/buildd/grub2-1.98/kern/partition.c:106: Detecting part_msdos...
/build/buildd/grub2-1.98/kern/partition.c:112: part_msdos detection failed.
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `hd2'.
/usr/sbin/grub-probe: info: opening rootvol_tmp-ubuntu_root.
/build/buildd/grub2-1.98/kern/disk.c:245: Opening `rootvol_tmp-ubuntu_root'...
/build/buildd/grub2-1.98/kern/disk.c:320: Opening `rootvol_tmp-ubuntu_root' 
failed.
/build/buildd/grub2-1.98/kern/disk.c:333: Closing `rootvol_tmp-ubuntu_root'

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https://bugs.launchpad.net/bugs/708657

Title:
  error: no mapping exists for `rootvol_tmp-ubuntu_root'

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