Se você conseguir efetuar login no sistema Ubuntu instalado, abra um terminal e execute sudo update-grub para permitir que o GRUB atualize suas entradas.
Eu originalmente tinha o Windows 7 e o Ubuntu 12.04 instalados. Depois que eu instalei o Windows preview em uma partição lógica, o gerenciador de inicialização do Windows mostrou apenas o Windows 7 e o Windows 8, não havia opção de iniciar o Ubuntu, então eu reinstalei o GRUB (seguindo este procedimento mas agora o GRUB mostra apenas o Ubuntu 12.04.
Eu executei o script de informações de inicialização, e este é o RESULTS.txt que eu obtive
============================= Boot Info Summary: ===============================
=> Grub2 (v1.99) is installed in the MBR of /dev/sda and looks at sector 1 of
the same hard drive for core.img. core.img is at this location and looks
for (,msdos3)/boot/grub on this drive.
sda1: __________________________________________________________________________
File system: ntfs
Boot sector type: Windows Vista/7: NTFS
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files: /grldr /bootmgr /Boot/BCD /grldr
sda2: __________________________________________________________________________
File system: ntfs
Boot sector type: Windows Vista/7: NTFS
Boot sector info: No errors found in the Boot Parameter Block.
Operating System: Windows 7
Boot files: /Windows/System32/winload.exe
sda3: __________________________________________________________________________
File system: ext4
Boot sector type: Grub2 (v1.99)
Boot sector info: Grub2 (v1.99) is installed in the boot sector of sda3
and looks at sector 1920334440 of the same hard drive
for core.img. core.img is at this location and looks
for (,msdos3)/boot/grub on this drive.
Operating System: Ubuntu 12.04 LTS
Boot files: /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img
sda4: __________________________________________________________________________
File system: Extended Partition
Boot sector type: Unknown
Boot sector info:
sda5: __________________________________________________________________________
File system: ntfs
Boot sector type: Windows Vista/7: NTFS
Boot sector info: According to the info in the boot sector, sda5 starts
at sector 63.
Operating System:
Boot files:
sda6: __________________________________________________________________________
File system: ntfs
Boot sector type: Windows Vista/7: NTFS
Boot sector info: According to the info in the boot sector, sda6 starts
at sector 63.
Operating System:
Boot files:
sda7: __________________________________________________________________________
File system: ntfs
Boot sector type: Windows Vista/7: NTFS
Boot sector info: According to the info in the boot sector, sda7 starts
at sector 63.
Operating System:
Boot files: /bootmgr /Windows/System32/winload.exe
============================ Drive/Partition Info: =============================
Drive: sda _____________________________________________________________________
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
Partition Boot Start Sector End Sector # of Sectors Id System
/dev/sda1 * 2,048 206,847 204,800 7 NTFS / exFAT / HPFS
/dev/sda2 962,562,048 1,910,774,879 948,212,832 7 NTFS / exFAT / HPFS
/dev/sda3 1,910,774,880 1,953,519,119 42,744,240 83 Linux
/dev/sda4 206,910 962,554,319 962,347,410 f W95 Extended (LBA)
/dev/sda5 206,912 102,402,047 102,195,136 7 NTFS / exFAT / HPFS
/dev/sda6 102,402,111 942,081,839 839,679,729 7 NTFS / exFAT / HPFS
/dev/sda7 942,081,903 962,554,319 20,472,417 7 NTFS / exFAT / HPFS
"blkid" output: ________________________________________________________________
Device UUID TYPE LABEL
/dev/sda1 2AF85FE4F85FAD37 ntfs System Reserved
/dev/sda2 C46A69CD6A69BCB4 ntfs
/dev/sda3 70fc8e20-b69b-47cd-98cf-9c9b0b30e537 ext4
/dev/sda5 B66E58FA6E58B4B9 ntfs
/dev/sda6 D4A667A2A66783B8 ntfs
/dev/sda7 C05AB0F95AB0ED72 ntfs
================================ Mount points: =================================
Device Mount_Point Type Options
/dev/sda3 / ext4 (rw,errors=remount-ro)
/dev/sda6 /media/D4A667A2A66783B8 fuseblk (rw,nosuid,nodev,allow_other,default_permissions,blksize=4096)
/dev/sda7 /media/C05AB0F95AB0ED72 fuseblk (rw,nosuid,nodev,allow_other,default_permissions,blksize=4096)
========================== sda1/grldr embedded menu: ===========================
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
=========================== sda3/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 "${boot_once}" ]; then save_env recordfail; fi; fi
}
function load_video {
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
}
insmod part_msdos
insmod ext2
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set=root 70fc8e20-b69b-47cd-98cf-9c9b0b30e537
if loadfont /usr/share/grub/unicode.pf2 ; then
set gfxmode=auto
load_video
insmod gfxterm
insmod part_msdos
insmod ext2
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set=root 70fc8e20-b69b-47cd-98cf-9c9b0b30e537
set locale_dir=($root)/boot/grub/locale
set lang=en_US
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 [ ${match} = 0 ]; then
set linux_gfx_mode=keep
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=keep
fi
else
set linux_gfx_mode=text
fi
export linux_gfx_mode
if [ "$linux_gfx_mode" != "text" ]; then load_video; fi
menuentry 'Ubuntu, with Linux 3.2.0-24-generic-pae' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set=root 70fc8e20-b69b-47cd-98cf-9c9b0b30e537
linux /boot/vmlinuz-3.2.0-24-generic-pae root=UUID=70fc8e20-b69b-47cd-98cf-9c9b0b30e537 ro quiet splash $vt_handoff
initrd /boot/initrd.img-3.2.0-24-generic-pae
}
menuentry 'Ubuntu, with Linux 3.2.0-24-generic-pae (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod gzio
insmod part_msdos
insmod ext2
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set=root 70fc8e20-b69b-47cd-98cf-9c9b0b30e537
echo 'Loading Linux 3.2.0-24-generic-pae ...'
linux /boot/vmlinuz-3.2.0-24-generic-pae root=UUID=70fc8e20-b69b-47cd-98cf-9c9b0b30e537 ro recovery nomodeset
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.2.0-24-generic-pae
}
submenu "Previous Linux versions" {
menuentry 'Ubuntu, with Linux 3.2.0-23-generic-pae' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set=root 70fc8e20-b69b-47cd-98cf-9c9b0b30e537
linux /boot/vmlinuz-3.2.0-23-generic-pae root=UUID=70fc8e20-b69b-47cd-98cf-9c9b0b30e537 ro quiet splash $vt_handoff
initrd /boot/initrd.img-3.2.0-23-generic-pae
}
menuentry 'Ubuntu, with Linux 3.2.0-23-generic-pae (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod gzio
insmod part_msdos
insmod ext2
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set=root 70fc8e20-b69b-47cd-98cf-9c9b0b30e537
echo 'Loading Linux 3.2.0-23-generic-pae ...'
linux /boot/vmlinuz-3.2.0-23-generic-pae root=UUID=70fc8e20-b69b-47cd-98cf-9c9b0b30e537 ro recovery nomodeset
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.2.0-23-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,msdos3)'
search --no-floppy --fs-uuid --set=root 70fc8e20-b69b-47cd-98cf-9c9b0b30e537
linux16 /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
insmod part_msdos
insmod ext2
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set=root 70fc8e20-b69b-47cd-98cf-9c9b0b30e537
linux16 /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###
### BEGIN /etc/grub.d/30_os-prober ###
### 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 $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
--------------------------------------------------------------------------------
=============================== sda3/etc/fstab: ================================
--------------------------------------------------------------------------------
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
# / was on /dev/sda3 during installation
UUID=70fc8e20-b69b-47cd-98cf-9c9b0b30e537 / ext4 errors=remount-ro 0 1
/dev/fd0 /media/floppy0 auto rw,user,noauto,exec,utf8 0 0
--------------------------------------------------------------------------------
=================== sda3: Location of files loaded by Grub: ====================
GiB - GB File Fragment(s)
= boot/grub/core.img 1
= boot/grub/grub.cfg 1
= boot/initrd.img-3.2.0-23-generic-pae 2
= boot/initrd.img-3.2.0-24-generic-pae 2
= boot/vmlinuz-3.2.0-23-generic-pae 1
= boot/vmlinuz-3.2.0-24-generic-pae 1
= initrd.img 2
= initrd.img.old 2
= vmlinuz 1
= vmlinuz.old 1
======================== Unknown MBRs/Boot Sectors/etc: ========================
Unknown BootLoader on sda4
00000000 00 26 01 26 02 26 03 26 04 26 05 26 06 26 07 26 |.&.&.&.&.&.&.&.&|
00000010 08 26 09 26 0a 26 0b 26 0c 26 0d 26 0e 26 0f 26 |.&.&.&.&.&.&.&.&|
00000020 10 26 11 26 12 26 13 26 14 26 15 26 16 26 17 26 |.&.&.&.&.&.&.&.&|
00000030 18 26 19 26 1a 26 1b 26 1c 26 1d 26 1e 26 1f 26 |.&.&.&.&.&.&.&.&|
00000040 20 26 21 26 22 26 23 26 24 26 25 26 26 26 27 26 | &!&"&#&$&%&&&'&|
00000050 28 26 29 26 2a 26 2b 26 2c 26 2d 26 2e 26 2f 26 |(&)&*&+&,&-&.&/&|
00000060 30 26 31 26 32 26 33 26 34 26 35 26 36 26 37 26 |0&1&2&3&4&5&6&7&|
00000070 38 26 39 26 3a 26 3b 26 3c 26 3d 26 3e 26 3f 26 |8&9&:&;&<&=&>&?&|
00000080 40 26 41 26 42 26 43 26 44 26 45 26 46 26 47 26 |@&A&B&C&D&E&F&G&|
00000090 48 26 49 26 4a 26 4b 26 4c 26 4d 26 4e 26 4f 26 |H&I&J&K&L&M&N&O&|
000000a0 50 26 51 26 52 26 53 26 54 26 55 26 56 26 57 26 |P&Q&R&S&T&U&V&W&|
000000b0 58 26 59 26 5a 26 5b 26 5c 26 5d 26 5e 26 5f 26 |X&Y&Z&[&\&]&^&_&|
000000c0 60 26 61 26 62 26 63 26 64 26 65 26 66 26 67 26 |'&a&b&c&d&e&f&g&|
000000d0 68 26 69 26 6a 26 6b 26 6c 26 6d 26 6e 26 6f 26 |h&i&j&k&l&m&n&o&|
000000e0 70 26 71 26 72 26 73 26 74 26 75 26 76 26 77 26 |p&q&r&s&t&u&v&w&|
000000f0 78 26 79 26 7a 26 7b 26 7c 26 7d 26 7e 26 7f 26 |x&y&z&{&|&}&~&.&|
00000100 80 26 81 26 82 26 83 26 84 26 85 26 86 26 87 26 |.&.&.&.&.&.&.&.&|
00000110 88 26 89 26 8a 26 8b 26 8c 26 8d 26 8e 26 8f 26 |.&.&.&.&.&.&.&.&|
00000120 90 26 91 26 92 26 93 26 94 26 95 26 96 26 97 26 |.&.&.&.&.&.&.&.&|
00000130 98 26 99 26 9a 26 9b 26 9c 26 9d 26 9e 26 9f 26 |.&.&.&.&.&.&.&.&|
00000140 a0 26 a1 26 a2 26 a3 26 a4 26 a5 26 a6 26 a7 26 |.&.&.&.&.&.&.&.&|
00000150 a8 26 a9 26 aa 26 ab 26 ac 26 ad 26 ae 26 af 26 |.&.&.&.&.&.&.&.&|
00000160 b0 26 b1 26 b2 26 b3 26 b4 26 b5 26 b6 26 b7 26 |.&.&.&.&.&.&.&.&|
00000170 b8 26 b9 26 ba 26 bb 26 bc 26 bd 26 be 26 bf 26 |.&.&.&.&.&.&.&.&|
00000180 c0 26 c1 26 c2 26 c3 26 c4 26 c5 26 c6 26 c7 26 |.&.&.&.&.&.&.&.&|
00000190 c8 26 c9 26 ca 26 cb 26 cc 26 cd 26 ce 26 cf 26 |.&.&.&.&.&.&.&.&|
000001a0 d0 26 d1 26 d2 26 d3 26 d4 26 d5 26 d6 26 d7 26 |.&.&.&.&.&.&.&.&|
000001b0 d8 26 d9 26 da 26 db 26 dc 26 dd 26 de 26 00 a4 |.&.&.&.&.&.&.&..|
000001c0 15 0d 07 ef ff ff 02 00 00 00 c0 5f 17 06 00 ef |..........._....|
000001d0 ff ff 05 ef ff ff c2 5f 17 06 30 7f 0c 32 00 00 |......._..0..2..|
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
=============================== StdErr Messages: ===============================
xz: (stdin): Compressed data is corrupt
xz: (stdin): Compressed data is corrupt
awk: cmd. line:36: Math support is not compiled in
awk: cmd. line:36: Math support is not compiled in
awk: cmd. line:36: Math support is not compiled in
awk: cmd. line:36: Math support is not compiled in
awk: cmd. line:36: Math support is not compiled in
awk: cmd. line:36: Math support is not compiled in
awk: cmd. line:36: Math support is not compiled in
awk: cmd. line:36: Math support is not compiled in
awk: cmd. line:36: Math support is not compiled in
awk: cmd. line:36: Math support is not compiled in
Se você conseguir efetuar login no sistema Ubuntu instalado, abra um terminal e execute sudo update-grub para permitir que o GRUB atualize suas entradas.