OK, I've seen some post that seems to show the same problem and I noted that is very useful use de Boot Info Script.. so I've used it.
Here its content
Boot Info Script 0.55 dated February 15th, 2010
============================= Boot Info Summary: ==============================
=> Grub 2 is installed in the MBR of /dev/sda and looks on the same drive in
partition #8 for (,msdos8)/boot/grub.
sda1: __________________________________________________ _______________________
File system: ntfs
Boot sector type: Windows Vista/7
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files/dirs: /bootmgr /Boot/BCD
sda2: __________________________________________________ _______________________
File system: ntfs
Boot sector type: Windows Vista/7
Boot sector info: No errors found in the Boot Parameter Block.
Operating System: Windows 7
Boot files/dirs: /Windows/System32/winload.exe /wubildr.mbr
/ubuntu/winboot/wubildr.mbr /wubildr
/ubuntu/winboot/wubildr
sda3: __________________________________________________ _______________________
File system: ntfs
Boot sector type: Windows Vista/7
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files/dirs: /BOOTMGR /BOOT/BCD
sda4: __________________________________________________ _______________________
File system: Extended Partition
Boot sector type: Unknown
Boot sector info:
sda5: __________________________________________________ _______________________
File system: ntfs
Boot sector type: Windows Vista/7
Boot sector info: According to the info in the boot sector, sda5 starts
at sector 63.
Operating System:
Boot files/dirs:
sda6: __________________________________________________ _______________________
File system: vfat
Boot sector type: Windows XP: Fat32
Boot sector info: According to the info in the boot sector, sda6 starts
at sector 63.
Operating System:
Boot files/dirs:
sda7: __________________________________________________ _______________________
File system: swap
Boot sector type: -
Boot sector info:
sda8: __________________________________________________ _______________________
File system: ext4
Boot sector type: -
Boot sector info:
Operating System: Ubuntu 10.10
Boot files/dirs: /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img
sda9: __________________________________________________ _______________________
File system: ext4
Boot sector type: -
Boot sector info:
Operating System:
Boot files/dirs:
=========================== Drive/Partition Info: =============================
Drive: sda ___________________ __________________________________________________ ___
Disco /dev/sda: 500.1 GB, 500107862016 bytes
255 cabezas, 63 sectores/pista, 60801 cilindros, 976773168 sectores en total
Unidades = sectores de 1 * 512 = 512 bytes
Tamaño de sector (lógico / físico): 512 bytes / 512 bytes
Partition Boot Start End Size Id System
/dev/sda1 * 2,048 3,074,047 3,072,000 27 Hidden HPFS/NTFS
/dev/sda2 3,074,048 231,384,194 228,310,147 7 HPFS/NTFS
/dev/sda3 955,572,224 976,773,119 21,200,896 17 Hidden HPFS/NTFS
/dev/sda4 231,384,256 955,572,223 724,187,968 f W95 Ext d (LBA)
/dev/sda5 231,384,258 640,993,499 409,609,242 7 HPFS/NTFS
/dev/sda6 640,993,563 850,722,074 209,728,512 b W95 FAT32
/dev/sda7 953,573,376 955,572,223 1,998,848 82 Linux swap / Solaris
/dev/sda8 850,722,816 923,570,175 72,847,360 83 Linux
/dev/sda9 923,572,224 953,569,279 29,997,056 83 Linux
blkid -c /dev/null: __________________________________________________ __________
Device UUID TYPE LABEL
/dev/loop0 squashfs
/dev/sda1 58BE7B4CBE7B2224 ntfs System
/dev/sda2 0AEEC054EEC039A9 ntfs LPR 1
/dev/sda3 F010C6A810C6755E ntfs HDDRECOVERY
/dev/sda4: PTTYPE="dos"
/dev/sda5 C444731544730986 ntfs LPR 2
/dev/sda6 14F4-3E04 vfat SHARED
/dev/sda7 eaa7c762-0840-486d-b8cf-cf526ee2b589 swap
/dev/sda8 6e11b236-d741-4316-95a0-e4983bac9a2b ext4
/dev/sda9 bc43e5e9-ad58-452e-83db-90743d8bbf8f ext4
/dev/sda: PTTYPE="dos"
============================ "mount | grep ^/dev output: ===========================
Device Mount_Point Type Options
aufs / aufs (rw)
/dev/sr0 /cdrom iso9660 (ro,noatime)
/dev/loop0 /rofs squashfs (ro,noatime)
/dev/sda5 /media/LPR 2 fuseblk (rw,nosuid,nodev,allow_other,blksize=4096,default_ permissions)
=========================== sda8/boot/grub/grub.cfg: ===========================
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#
### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
set have_grubenv=true
load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi
function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}
function recordfail {
set recordfail=1
if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}
function load_video {
insmod vbe
insmod vga
}
insmod part_msdos
insmod ext2
set root='(hd0,msdos8)'
search --no-floppy --fs-uuid --set 6e11b236-d741-4316-95a0-e4983bac9a2b
if loadfont /usr/share/grub/unicode.pf2 ; then
set gfxmode=640x480
load_video
insmod gfxterm
fi
terminal_output gfxterm
insmod part_msdos
insmod ext2
set root='(hd0,msdos8)'
search --no-floppy --fs-uuid --set 6e11b236-d741-4316-95a0-e4983bac9a2b
set locale_dir=($root)/boot/grub/locale
set lang=es
insmod gettext
if [ "${recordfail}" = 1 ]; then
set timeout=-1
else
set timeout=10
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
### END /etc/grub.d/05_debian_theme ###
### BEGIN /etc/grub.d/10_linux ###
menuentry 'Ubuntu, with Linux 2.6.35-25-generic-pae' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod part_msdos
insmod ext2
set root='(hd0,msdos8)'
search --no-floppy --fs-uuid --set 6e11b236-d741-4316-95a0-e4983bac9a2b
linux /boot/vmlinuz-2.6.35-25-generic-pae root=UUID=6e11b236-d741-4316-95a0-e4983bac9a2b ro quiet splash
initrd /boot/initrd.img-2.6.35-25-generic-pae
}
menuentry 'Ubuntu, with Linux 2.6.35-25-generic-pae (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod part_msdos
insmod ext2
set root='(hd0,msdos8)'
search --no-floppy --fs-uuid --set 6e11b236-d741-4316-95a0-e4983bac9a2b
echo 'Loading Linux 2.6.35-25-generic-pae ...'
linux /boot/vmlinuz-2.6.35-25-generic-pae root=UUID=6e11b236-d741-4316-95a0-e4983bac9a2b ro single
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-2.6.35-25-generic-pae
}
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
insmod part_msdos
insmod ext2
set root='(hd0,msdos8)'
search --no-floppy --fs-uuid --set 6e11b236-d741-4316-95a0-e4983bac9a2b
linux16 /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
insmod part_msdos
insmod ext2
set root='(hd0,msdos8)'
search --no-floppy --fs-uuid --set 6e11b236-d741-4316-95a0-e4983bac9a2b
linux16 /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###
### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Windows 7 (loader) (on /dev/sda1)" {
insmod part_msdos
insmod ntfs
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set 58be7b4cbe7b2224
chainloader +1
}
menuentry "Windows Vista (loader) (on /dev/sda3)" {
insmod part_msdos
insmod ntfs
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set f010c6a810c6755e
chainloader +1
}
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###
### BEGIN /etc/grub.d/41_custom ###
if [ -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
=============================== sda8/etc/fstab: ===============================
# /etc/fstab: static file system information.
#
# Use 'blkid -o value -s UUID' to print the universally unique identifier
# for a device; this may be used with UUID= as a more robust way to name
# devices that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
# / was on /dev/sda8 during installation
UUID=6e11b236-d741-4316-95a0-e4983bac9a2b / ext4 errors=remount-ro 0 1
# /home was on /dev/sda9 during installation
UUID=bc43e5e9-ad58-452e-83db-90743d8bbf8f /home ext4 defaults 0 2
# swap was on /dev/sda7 during installation
UUID=eaa7c762-0840-486d-b8cf-cf526ee2b589 none swap sw 0 0
=================== sda8: Location of files loaded by Grub: ===================
457.1GB: boot/grub/core.img
444.3GB: boot/grub/grub.cfg
438.4GB: boot/initrd.img-2.6.35-25-generic-pae
457.1GB: boot/vmlinuz-2.6.35-25-generic-pae
438.4GB: initrd.img
457.1GB: vmlinuz
=========================== Unknown MBRs/Boot Sectors/etc =======================
Unknown BootLoader on sda4
00000000 37 5e 07 e7 f1 89 11 df f0 8b 6e 44 25 aa 08 12 |7^........nD%...|
00000010 57 e5 52 2f b9 75 f0 df 95 48 bd db 61 15 e9 45 |W.R/.u...H..a..E|
00000020 7d 69 4f 48 40 fc 16 71 1c d9 d5 dd 32 01 7b 01 |}iOH@..q....2.{.|
00000030 e2 e0 09 e8 0f 3d 0c aa 6a 42 bb fd b1 11 e8 56 |.....=..jB.....V|
00000040 5d 93 0a c4 15 86 d5 62 0d f7 3a 68 c8 1f 99 95 |]......b..:h....|
00000050 0a cf 7c d1 44 b6 5d 64 2b 9f 86 23 e9 1b 90 ae |..|.D.]d+..#....|
00000060 7e 3b 58 94 f5 97 e8 1c 07 dd 77 bd 24 7a 40 69 |~;X.......w.$z@i|
00000070 98 37 97 3a 75 38 a9 9c ab c9 95 fa c2 b6 97 50 |.7.:u8.........P|
00000080 72 38 0f e7 33 c8 b4 d2 b9 57 9e 96 11 a4 c6 37 |r8..3....W.....7|
00000090 2a 26 ad 84 7c 3c d3 e6 b8 7c 0f 58 fb 45 34 fe |*&..|<...|.X.E4.|
000000a0 6a 26 b6 22 7a 6a ad 9a 22 69 fe c1 4d 53 d0 5a |j&."zj.."i..MS.Z|
000000b0 06 3c db f7 1f 5e 7e f1 e2 db 9e 7e 87 9c 73 9f |.<...^~....~..s.|
000000c0 1a 87 28 2a fd 53 e6 1d ff af fa bb c3 75 d7 be |..(*.S.......u..|
000000d0 bf dd 73 52 ef 03 32 3d 13 93 b4 55 fa e6 ee 4a |..sR..2=...U...J|
000000e0 f0 27 ac bd 7d e5 94 d5 27 94 67 e2 02 5c 7b c7 |.'..}...'.g..\{.|
000000f0 80 fd 4a 66 76 47 71 af 5c 55 0f d0 37 1c a2 a9 |..JfvGq.\U..7...|
00000100 92 c2 66 b8 af 39 9f c7 87 39 6f 71 49 03 9c 03 |..f..9...9oqI...|
00000110 bb ab 2b dd ac fd d8 13 da 33 40 bd fd b6 1d b9 |..+......3@.....|
00000120 d7 df 3a 7a 67 80 9f 57 cc 3f 53 96 10 f5 a9 ef |..:zg..W.?S.....|
00000130 78 6e 9f 4e ab 4e e9 61 db 86 f9 b5 ce ba 45 54 |xn.N.N.a......ET|
00000140 64 46 c1 c1 5f 86 dd 73 ae cb 1e 90 92 50 db b1 |dF.._..s.....P..|
00000150 13 dd 05 f5 3e ac 05 e7 86 e8 1c 45 b1 d0 fc 63 |....>......E...c|
00000160 c0 9f 4e 44 41 41 7c 2a 72 79 57 3a 8d 2a 3d c7 |..NDAA|*ryW:.*=.|
00000170 01 39 5b 0f 23 4e 27 4e 4d 87 9d 1e 06 b9 34 23 |.9[.#N'NM.....4#|
00000180 ef 2e 80 e3 f5 ab 4a f3 02 3e db 69 be 8d 27 a1 |......J..>.i..'.|
00000190 d6 fd 38 04 6b 27 51 6d ec 83 45 5b cc ea 27 2a |..8.k'Qm..E[..'*|
000001a0 ae fd 72 a8 35 af dd b4 6d 06 bd 32 1f a9 0b 0b |..r.5...m..2....|
000001b0 02 4c 84 57 e8 15 06 01 c0 9b ec 14 f4 3f 00 fe |.L.W.........?..|
000001c0 ff ff 07 fe ff ff 02 00 00 00 1a 24 6a 18 00 fe |...........$j...|
000001d0 ff ff 05 fe ff ff 1c 24 6a 18 3f 34 80 0c 00 00 |.......$j.?4....|
000001e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000001f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 aa |..............U.|
00000200
I hope someone can help me
PD. I'm running the Try UBUNTU mode.