Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

I've recently installed ubuntu 13on a partition with windows 8 but i can't return on the windows loader. I got Error invalid signature when i select windows 8.However ubuntu works perfectly.

I've search on internet and tested a solution with os-proper but it's change nothing:

:~$ sudo os-prober  
grub-probe: error: unknown filesystem.
/dev/sda1:Windows 8 (loader):Windows:chain

:~$ sudo update-grub
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-3.8.0-27-generic
Found initrd image: /boot/initrd.img-3.8.0-27-generic
Found linux image: /boot/vmlinuz-3.8.0-26-generic
Found initrd image: /boot/initrd.img-3.8.0-26-generic
Found linux image: /boot/vmlinuz-3.8.0-19-generic
Found initrd image: /boot/initrd.img-3.8.0-19-generic
Found memtest86+ image: /boot/memtest86+.bin
grub-probe: error: unknown filesystem.
Found Windows 8 (loader) on /dev/sda1
/usr/sbin/grub-probe: error: unknown filesystem.
done

for more details on the configuration:

~$ sudo fdisk -l
Disk /dev/sda: 750.2 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders, total 1465149168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x3f78334c

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048   715057151   357527552    7  HPFS/NTFS/exFAT
/dev/sda2       715059200  1151722887   218331844    7  HPFS/NTFS/exFAT
/dev/sda3      1151723518  1465147391   156711937    5  Extended
Partition 3 does not start on physical sector boundary.
/dev/sda5      1151723520  1452771327   150523904   83  Linux
/dev/sda6      1452773376  1465147391     6187008   82  Linux swap / Solaris

thanks in advance.

EDIT1: ~$ cat /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 [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

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 {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

if [ x$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_msdos
insmod ext2
set root='hd0,msdos5'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5  c516a53f-bfa3-4140-8a30-18967123caa2
else
  search --no-floppy --fs-uuid --set=root c516a53f-bfa3-4140-8a30-18967123caa2
fi
    font="/usr/share/grub/unicode.pf2"
fi

if loadfont $font ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=fr_FR
  insmod gettext
fi
terminal_output gfxterm
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
if background_color 44,0,30; then
  clear
fi
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
function gfxmode {
    set gfxpayload="${1}"
    if [ "${1}" = "keep" ]; then
        set vt_handoff=vt.handoff=7
    else
        set vt_handoff=
    fi
}
if [ "${recordfail}" != 1 ]; then
  if [ -e ${prefix}/gfxblacklist.txt ]; then
    if hwmatch ${prefix}/gfxblacklist.txt 3; then
      if [ ${match} = 0 ]; then
        set linux_gfx_mode=keep
      else
        set linux_gfx_mode=text
      fi
    else
      set linux_gfx_mode=text
    fi
  else
    set linux_gfx_mode=keep
  fi
else
  set linux_gfx_mode=text
fi
export linux_gfx_mode
menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-c516a53f-bfa3-4140-8a30-18967123caa2' {
recordfail
    load_video
    gfxmode $linux_gfx_mode
    insmod gzio
    insmod part_msdos
    insmod ext2
    set root='hd0,msdos5'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5  c516a53f-bfa3-4140-8a30-18967123caa2
    else
      search --no-floppy --fs-uuid --set=root c516a53f-bfa3-4140-8a30-18967123caa2
    fi
    linux   /boot/vmlinuz-3.8.0-27-generic root=UUID=c516a53f-bfa3-4140-8a30-18967123caa2 ro   quiet splash $vt_handoff
    initrd  /boot/initrd.img-3.8.0-27-generic
}
submenu 'Advanced options for Ubuntu' $menuentry_id_option 'gnulinux-advanced-c516a53f-bfa3-4140-8a30-18967123caa2' {
    menuentry 'Ubuntu, with Linux 3.8.0-27-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.8.0-27-generic-advanced-c516a53f-bfa3-4140-8a30-18967123caa2' {
    recordfail
        load_video
        gfxmode $linux_gfx_mode
        insmod gzio
        insmod part_msdos
        insmod ext2
        set root='hd0,msdos5'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5  c516a53f-bfa3-4140-8a30-18967123caa2
        else
          search --no-floppy --fs-uuid --set=root c516a53f-bfa3-4140-8a30-18967123caa2
        fi
        echo    'Loading Linux 3.8.0-27-generic ...'
        linux   /boot/vmlinuz-3.8.0-27-generic root=UUID=c516a53f-bfa3-4140-8a30-18967123caa2 ro   quiet splash $vt_handoff
        echo    'Loading initial ramdisk ...'
        initrd  /boot/initrd.img-3.8.0-27-generic
    }
    menuentry 'Ubuntu, with Linux 3.8.0-27-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.8.0-27-generic-recovery-c516a53f-bfa3-4140-8a30-18967123caa2' {
    recordfail
        load_video
        insmod gzio
        insmod part_msdos
        insmod ext2
        set root='hd0,msdos5'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5  c516a53f-bfa3-4140-8a30-18967123caa2
        else
          search --no-floppy --fs-uuid --set=root c516a53f-bfa3-4140-8a30-18967123caa2
        fi
        echo    'Loading Linux 3.8.0-27-generic ...'
        linux   /boot/vmlinuz-3.8.0-27-generic root=UUID=c516a53f-bfa3-4140-8a30-18967123caa2 ro recovery nomodeset 
        echo    'Loading initial ramdisk ...'
        initrd  /boot/initrd.img-3.8.0-27-generic
    }
    menuentry 'Ubuntu, with Linux 3.8.0-26-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.8.0-26-generic-advanced-c516a53f-bfa3-4140-8a30-18967123caa2' {
    recordfail
        load_video
        gfxmode $linux_gfx_mode
        insmod gzio
        insmod part_msdos
        insmod ext2
        set root='hd0,msdos5'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5  c516a53f-bfa3-4140-8a30-18967123caa2
        else
          search --no-floppy --fs-uuid --set=root c516a53f-bfa3-4140-8a30-18967123caa2
        fi
        echo    'Loading Linux 3.8.0-26-generic ...'
        linux   /boot/vmlinuz-3.8.0-26-generic root=UUID=c516a53f-bfa3-4140-8a30-18967123caa2 ro   quiet splash $vt_handoff
        echo    'Loading initial ramdisk ...'
        initrd  /boot/initrd.img-3.8.0-26-generic
    }
    menuentry 'Ubuntu, with Linux 3.8.0-26-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.8.0-26-generic-recovery-c516a53f-bfa3-4140-8a30-18967123caa2' {
    recordfail
        load_video
        insmod gzio
        insmod part_msdos
        insmod ext2
        set root='hd0,msdos5'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5  c516a53f-bfa3-4140-8a30-18967123caa2
        else
          search --no-floppy --fs-uuid --set=root c516a53f-bfa3-4140-8a30-18967123caa2
        fi
        echo    'Loading Linux 3.8.0-26-generic ...'
        linux   /boot/vmlinuz-3.8.0-26-generic root=UUID=c516a53f-bfa3-4140-8a30-18967123caa2 ro recovery nomodeset 
        echo    'Loading initial ramdisk ...'
        initrd  /boot/initrd.img-3.8.0-26-generic
    }
    menuentry 'Ubuntu, with Linux 3.8.0-19-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.8.0-19-generic-advanced-c516a53f-bfa3-4140-8a30-18967123caa2' {
    recordfail
        load_video
        gfxmode $linux_gfx_mode
        insmod gzio
        insmod part_msdos
        insmod ext2
        set root='hd0,msdos5'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5  c516a53f-bfa3-4140-8a30-18967123caa2
        else
          search --no-floppy --fs-uuid --set=root c516a53f-bfa3-4140-8a30-18967123caa2
        fi
        echo    'Loading Linux 3.8.0-19-generic ...'
        linux   /boot/vmlinuz-3.8.0-19-generic root=UUID=c516a53f-bfa3-4140-8a30-18967123caa2 ro   quiet splash $vt_handoff
        echo    'Loading initial ramdisk ...'
        initrd  /boot/initrd.img-3.8.0-19-generic
    }
    menuentry 'Ubuntu, with Linux 3.8.0-19-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.8.0-19-generic-recovery-c516a53f-bfa3-4140-8a30-18967123caa2' {
    recordfail
        load_video
        insmod gzio
        insmod part_msdos
        insmod ext2
        set root='hd0,msdos5'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5  c516a53f-bfa3-4140-8a30-18967123caa2
        else
          search --no-floppy --fs-uuid --set=root c516a53f-bfa3-4140-8a30-18967123caa2
        fi
        echo    'Loading Linux 3.8.0-19-generic ...'
        linux   /boot/vmlinuz-3.8.0-19-generic root=UUID=c516a53f-bfa3-4140-8a30-18967123caa2 ro recovery nomodeset 
        echo    'Loading initial ramdisk ...'
        initrd  /boot/initrd.img-3.8.0-19-generic
    }
}

### 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,msdos5'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5  c516a53f-bfa3-4140-8a30-18967123caa2
    else
      search --no-floppy --fs-uuid --set=root c516a53f-bfa3-4140-8a30-18967123caa2
    fi
    linux16 /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
    insmod part_msdos
    insmod ext2
    set root='hd0,msdos5'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5  c516a53f-bfa3-4140-8a30-18967123caa2
    else
      search --no-floppy --fs-uuid --set=root c516a53f-bfa3-4140-8a30-18967123caa2
    fi
    linux16 /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry 'Windows 8 (loader) (on /dev/sda1)' --class windows --class os $menuentry_id_option 'osprober-chain-/dev/sda1' {
    insmod ldm
    drivemap -s (hd0) ${root}
    chainloader +1
}
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/30_uefi-firmware ###
### END /etc/grub.d/30_uefi-firmware ###

### 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  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

edit 2:

**~$sudo mount /dev/sda1 /mnt**
**~$ sudo umount /mnt**

no problems

share|improve this question

migrated from stackoverflow.com Aug 14 '13 at 7:39

This question came from our site for professional and enthusiast programmers.

    
If you try to mount /dev/sda1, does it give you any errors? sudo mount /dev/sda1 /mnt;sudo umount /mnt –  Githlar Aug 14 '13 at 8:44
    
Also, can you paste the contents of /boot/grub/grub.cfg? –  Githlar Aug 14 '13 at 8:57
    
Yes, i've got errors, i add them on the EDIT. –  requinTueur Aug 14 '13 at 9:58
    
The command is sudo mount /dev/sda1 /mnt –  Githlar Aug 14 '13 at 10:40
    
Sorry, i corected this. –  requinTueur Aug 14 '13 at 14:04

1 Answer 1

up vote 1 down vote accepted

Try this tool-

Boot Repair

and tell us how it goes.

share|improve this answer
    
Perfect! wonderful tool, thank you –  requinTueur Aug 17 '13 at 16:48
    
You are welcome! :) –  Aaditya Bagga Aug 17 '13 at 18:13

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.