Cannot boot into Ubuntu after installing

[chaquito]

Hi,
I have just installed Ubuntu in a new laptop with Windows 7. I created a partition for Ubuntu and the installation went fine. However after rebooting (at the end of the installation) there was only a message from Windows 7 complaining that the MBR was corrupt, ignoring the message take me to a regular Windows 7 boot up, but there is no way to boot into Ubuntu.
Could anybody please help me to solve this?
I am including a file obtained after running the script from http://sourceforge.net/projects/bootinfoscript/


sudo bash ~/Desktop/bootinfoscript
Boot Info Script 0.61 [1 April 2012]


============================= Boot Info Summary: ===============================

=> Grub2 (v1.99) is installed in the MBR of /dev/sda and looks at sector
1307858944 of the same hard drive for core.img. core.img is at this
location and looks for (,gpt6)/boot/grub on this drive.

sda1: __________________________________________________ ________________________

File system: vfat
Boot sector type: Windows 7: FAT32
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files: /efi/Boot/bootx64.efi

sda2: __________________________________________________ ________________________

File system:
Boot sector type: -
Boot sector info:
Mounting failed: mount: unknown filesystem type ''

sda3: __________________________________________________ ________________________

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: /bootmgr /Boot/BCD /Windows/System32/winload.exe

sda4: __________________________________________________ ________________________

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: /bootmgr /boot/bcd

sda5: __________________________________________________ ________________________

File system: BIOS Boot partition
Boot sector type: Grub2's core.img
Boot sector info:

sda6: __________________________________________________ ________________________

File system: ext4
Boot sector type: -
Boot sector info:
Operating System: Ubuntu 12.04 LTS
Boot files: /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img

sda7: __________________________________________________ ________________________

File system: swap
Boot sector type: -
Boot sector info:

============================ Drive/Partition Info: =============================

Drive: sda __________________________________________________ ___________________

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

Partition Boot Start Sector End Sector # of Sectors Id System

/dev/sda1 1 1,465,149,167 1,465,149,167 ee GPT


GUID Partition Table detected.

Partition Start Sector End Sector # of Sectors System
/dev/sda1 2,048 411,647 409,600 EFI System partition
/dev/sda2 411,648 673,791 262,144 Microsoft Reserved Partition (Windows)
/dev/sda3 673,792 1,307,858,943 1,307,185,152 Data partition (Windows/Linux)
/dev/sda4 1,412,718,592 1,465,147,391 52,428,800 Windows Recovery Environment (Windows)
/dev/sda5 1,307,858,944 1,307,860,897 1,954 BIOS Boot partition
/dev/sda6 1,307,860,898 1,396,175,351 88,314,454 Data partition (Windows/Linux)
/dev/sda7 1,396,175,352 1,412,718,591 16,543,240 Swap partition (Linux)

"blkid" output: __________________________________________________ ______________

Device UUID TYPE LABEL

/dev/loop0 squashfs
/dev/sda1 B211-28C8 vfat SYSTEM
/dev/sda3 8AF24081F240738B ntfs OS
/dev/sda4 AC7A43BA7A438056 ntfs Recovery
/dev/sda6 69cde522-8cf1-4852-94e6-14b216a6c065 ext4
/dev/sda7 8441fedb-0703-41b7-80a2-f5ea9bd3092a swap
/dev/sr0 iso9660 Ubuntu 12.04 LTS i386

================================ Mount points: =================================

Device Mount_Point Type Options

/dev/loop0 /rofs squashfs (ro,noatime)
/dev/sda6 /mnt ext4 (rw)
/dev/sr0 /cdrom iso9660 (ro,noatime)


=========================== sda6/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_gpt
insmod ext2
set root='(hd0,gpt6)'
search --no-floppy --fs-uuid --set=root 69cde522-8cf1-4852-94e6-14b216a6c065
if loadfont /usr/share/grub/unicode.pf2 ; then
set gfxmode=auto
load_video
insmod gfxterm
insmod part_gpt
insmod ext2
set root='(hd0,gpt6)'
search --no-floppy --fs-uuid --set=root 69cde522-8cf1-4852-94e6-14b216a6c065
set locale_dir=($root)/boot/grub/locale
set lang=en_CA
insmod gettext
fi
terminal_output gfxterm
if [ "${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 3.2.0-27-generic-pae' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
gfxmode $linux_gfx_mode
insmod gzio
insmod part_gpt
insmod ext2
set root='(hd0,gpt6)'
search --no-floppy --fs-uuid --set=root 69cde522-8cf1-4852-94e6-14b216a6c065
linux /boot/vmlinuz-3.2.0-27-generic-pae root=UUID=69cde522-8cf1-4852-94e6-14b216a6c065 ro quiet splash $vt_handoff
initrd /boot/initrd.img-3.2.0-27-generic-pae
}
menuentry 'Ubuntu, with Linux 3.2.0-27-generic-pae (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod gzio
insmod part_gpt
insmod ext2
set root='(hd0,gpt6)'
search --no-floppy --fs-uuid --set=root 69cde522-8cf1-4852-94e6-14b216a6c065
echo 'Loading Linux 3.2.0-27-generic-pae ...'
linux /boot/vmlinuz-3.2.0-27-generic-pae root=UUID=69cde522-8cf1-4852-94e6-14b216a6c065 ro recovery nomodeset
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.2.0-27-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_gpt
insmod ext2
set root='(hd0,gpt6)'
search --no-floppy --fs-uuid --set=root 69cde522-8cf1-4852-94e6-14b216a6c065
linux /boot/vmlinuz-3.2.0-23-generic-pae root=UUID=69cde522-8cf1-4852-94e6-14b216a6c065 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_gpt
insmod ext2
set root='(hd0,gpt6)'
search --no-floppy --fs-uuid --set=root 69cde522-8cf1-4852-94e6-14b216a6c065
echo 'Loading Linux 3.2.0-23-generic-pae ...'
linux /boot/vmlinuz-3.2.0-23-generic-pae root=UUID=69cde522-8cf1-4852-94e6-14b216a6c065 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_gpt
insmod ext2
set root='(hd0,gpt6)'
search --no-floppy --fs-uuid --set=root 69cde522-8cf1-4852-94e6-14b216a6c065
linux16 /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
insmod part_gpt
insmod ext2
set root='(hd0,gpt6)'
search --no-floppy --fs-uuid --set=root 69cde522-8cf1-4852-94e6-14b216a6c065
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/sda3)" --class windows --class os {
insmod part_gpt
insmod ntfs
set root='(hd0,gpt3)'
search --no-floppy --fs-uuid --set=root 8AF24081F240738B
chainloader +1
}
menuentry "Windows Recovery Environment (loader) (on /dev/sda4)" --class windows --class os {
insmod part_gpt
insmod ntfs
set root='(hd0,gpt4)'
search --no-floppy --fs-uuid --set=root AC7A43BA7A438056
drivemap -s (hd0) ${root}
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 ###
--------------------------------------------------------------------------------

=============================== sda6/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/sda6 during installation
UUID=69cde522-8cf1-4852-94e6-14b216a6c065 / ext4 errors=remount-ro 0 1
# swap was on /dev/sda7 during installation
UUID=8441fedb-0703-41b7-80a2-f5ea9bd3092a none swap sw 0 0
--------------------------------------------------------------------------------

=================== sda6: 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 1
= boot/initrd.img-3.2.0-27-generic-pae 1
= boot/vmlinuz-3.2.0-23-generic-pae 1
= boot/vmlinuz-3.2.0-27-generic-pae 1
= initrd.img 1
= vmlinuz 1

=============================== StdErr Messages: ===============================

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

[Alex de Borba]

I had the same issue and what I did was to reinstall Ubuntu again, and reboot a couple times until the option to login with Ubuntu shown up.

[drmrgd]

The issue here is that you have Windows installed in UEFI mode, and have installed Ubuntu in MBR mode. The two are not compatible, and you'll have to reinstall Ubuntu as UEFI in order to get the bootloader working correctly. For a little more info on how to do this, please see these links:

https://help.ubuntu.com/community/UEFIBooting

It should be as simple as booting the Ubuntu .iso installer in UEFI mode (this is important!) rather than MBR mode, pointing the Grub to the /boot_efi parition, and chain loading Windows from there.

Here's a nice post from a Forum user that has put a lot of effort into this, creating the Boot Info Script as well as the Boot Repair utility that I've heard is doing quite well to sort out even UEFI boot problems these days:

http://ubuntuforums.org/showpost.php?p=12036059&postcount=17

Hope that helps get you started. There are a number of people here with successful UEFI dual boot knowledge that can help you get this sorted out. So, definitely post back and let us know how it's going.

[chaquito]

Thank you very much!
Everything works fine now. For the record, the key was to re-install Ubuntu with the installer CD booted in UEFI mode. I had initially tried with Ubuntu 32-bit and couldn't do that but then I realized that for UEFI the 64-bit version is needed. I downloaded the 64-bit Ubuntu, burned it into a CD and booted in UEFI mode to do the installation. After that I could boot into Ubuntu from the grub boot menu without problems. Windows 7 however could not be loaded from the grub menu, but that was fixed after I run Boot-Repair.