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Sam24J
March 16th, 2011, 10:18 PM
Hi all,
I'm a pretty inexperienced Linux user, but have installed it a few times on various computers. I had some issues with my laptop (Dell XPS M1330), and after a fresh install of ubuntu 10.10 I cannot boot. All I get is a flashing _ symbol in the top left of the screen like a command prompt, except I can't type anything. I searched a few other forums and it appears to be a boot issue. I utilised the Boot Info Script:
http://bootinfoscript.sourceforge.net/

Can anyone tell me what this means?
these are my results...



Boot Info Script 0.55 dated February 15th, 2010

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

=> No boot loader is installed in the MBR of /dev/sda

sda1: __________________________________________________ _______________________

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

sda2: __________________________________________________ _______________________

File system: Extended Partition
Boot sector type: Unknown
Boot sector info:

sda5: __________________________________________________ _______________________

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

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

Drive: sda ___________________ __________________________________________________ ___

Disk /dev/sda: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders, total 488397168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition Boot Start End Size Id System

/dev/sda1 2,048 468,520,959 468,518,912 83 Linux
/dev/sda2 468,523,006 488,396,799 19,873,794 5 Extended
/dev/sda5 468,523,008 488,396,799 19,873,792 82 Linux swap / Solaris


blkid -c /dev/null: __________________________________________________ __________

Device UUID TYPE LABEL

/dev/loop0 squashfs
/dev/sda1 66a2e4b9-e0a6-4e33-8831-11c909c1139a ext4
/dev/sda2: PTTYPE="dos"
/dev/sda5 cdb59f73-03f7-474f-bc39-6f9d9afb1cf8 swap
/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)


=========================== sda1/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='(hd1,msdos1)'
search --no-floppy --fs-uuid --set 66a2e4b9-e0a6-4e33-8831-11c909c1139a
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='(hd1,msdos1)'
search --no-floppy --fs-uuid --set 66a2e4b9-e0a6-4e33-8831-11c909c1139a
set locale_dir=($root)/boot/grub/locale
set lang=en
insmod gettext
if [ "${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 2.6.35-27-generic-pae' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod part_msdos
insmod ext2
set root='(hd1,msdos1)'
search --no-floppy --fs-uuid --set 66a2e4b9-e0a6-4e33-8831-11c909c1139a
linux /boot/vmlinuz-2.6.35-27-generic-pae root=UUID=66a2e4b9-e0a6-4e33-8831-11c909c1139a ro quiet splash
initrd /boot/initrd.img-2.6.35-27-generic-pae
}
menuentry 'Ubuntu, with Linux 2.6.35-27-generic-pae (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod part_msdos
insmod ext2
set root='(hd1,msdos1)'
search --no-floppy --fs-uuid --set 66a2e4b9-e0a6-4e33-8831-11c909c1139a
echo 'Loading Linux 2.6.35-27-generic-pae ...'
linux /boot/vmlinuz-2.6.35-27-generic-pae root=UUID=66a2e4b9-e0a6-4e33-8831-11c909c1139a ro single
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-2.6.35-27-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='(hd1,msdos1)'
search --no-floppy --fs-uuid --set 66a2e4b9-e0a6-4e33-8831-11c909c1139a
linux16 /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
insmod part_msdos
insmod ext2
set root='(hd1,msdos1)'
search --no-floppy --fs-uuid --set 66a2e4b9-e0a6-4e33-8831-11c909c1139a
linux16 /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
if [ "x${timeout}" != "x-1" ]; then
if keystatus; then
if keystatus --shift; then
set timeout=-1
else
set timeout=0
fi
else
if sleep --interruptible 3 ; then
set timeout=0
fi
fi
fi
### 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 ###

=============================== sda1/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/sda1 during installation
UUID=66a2e4b9-e0a6-4e33-8831-11c909c1139a / ext4 errors=remount-ro 0 1
# swap was on /dev/sda5 during installation
UUID=cdb59f73-03f7-474f-bc39-6f9d9afb1cf8 none swap sw 0 0

=================== sda1: Location of files loaded by Grub: ===================


116.1GB: boot/grub/core.img
137.6GB: boot/grub/grub.cfg
.8GB: boot/initrd.img-2.6.35-27-generic-pae
116.1GB: boot/vmlinuz-2.6.35-27-generic-pae
.8GB: initrd.img
116.1GB: vmlinuz
=========================== Unknown MBRs/Boot Sectors/etc =======================

Unknown BootLoader on sda2

00000000 77 66 42 22 a4 4e 7c 6d 7c 00 6c 07 6c 00 6c 79 |wfB".N|m|.l.l.ly|
00000010 7c 07 22 7c 60 7c 00 36 fc 00 02 44 77 66 42 58 ||."|`|.6...DwfBX|
00000020 5c 1f 7c 07 7c 00 6c 07 6c 00 6c 06 6c 00 22 9c |\.|.|.l.l.l.l.".|
00000030 60 7c 00 2e fc 00 5c 17 9c 0f 7d 07 5c dc 07 7c |`|....\...}.\..||
00000040 00 6c 07 6c 00 6c 06 2a 0c 00 2a fc 00 7c 03 ac |.l.l.l.*..*..|..|
00000050 00 7f 48 d0 43 60 5c 0f 6c 6d 7c 00 bc 02 14 00 |..H.C`\.lm|.....|
00000060 a6 20 02 fc 00 6e 38 43 64 5c 07 6c af 7c 00 fc |. ...n8Cd\.l.|..|
00000070 07 2a ec 00 ac ce 28 ff 0c c7 2b 00 23 9c ed 8c |.*....(...+.#...|
00000080 05 60 65 80 01 24 ac 5b 7c 88 6c 07 a8 02 9c 63 |.`e..$.[|.l....c|
00000090 88 01 5e cc c2 00 2d 1c b3 6c 6e 7c 86 60 04 7c |..^...-..ln|.`.||
000000a0 7f 28 dc 00 7c 67 26 9e af 0f 42 2e dc 00 6c 7d |.(..|g&...B...l}|
000000b0 7c 0c 7c 06 7c ae 2d dc 00 9c 2a 7c 9a 2e dc 00 ||.|.|.-...*|....|
000000c0 7c 70 6c 07 6c 06 7c 07 fc 06 2e 3c 13 2e dc 00 ||pl.l.|....<....|
000000d0 6c 70 6c 06 7c 0d 7c 15 fc 06 7c 01 ac 00 bc 30 |lpl.|.|...|....0|
000000e0 2e dc 00 6c 6f 6c 1c 6c 07 2a bc 01 2e fc 12 2e |...lol.l.*......|
000000f0 dc 00 6c 7f 7c 0a 6c 06 2a 5c 04 5c 7e 7c 35 69 |..l.|.l.*\.\~|5i|
00000100 03 00 7c 96 2e dc 00 6c 40 7c 05 60 04 6c 07 31 |..|....l@|.`.l.1|
00000110 9c 02 7c 07 22 3d 21 42 7c 18 7c 04 22 10 ba 6c |..|."=!B|.|."..l|
00000120 74 7c 97 6c 02 7c 07 28 dc 00 7c 1a 94 04 70 00 |t|.l.|.(..|...p.|
00000130 2f dc 00 7c d5 7c 8e 70 03 2a dc 00 2e 7c 10 2e |/..|.|.p.*...|..|
00000140 9c 02 12 58 00 7c 75 6c 0e 31 dc 00 9c 37 7c 72 |...X.|ul.1...7|r|
00000150 2e dd 00 1e 5c 54 6c 29 7c 0d 6c 15 28 9c 02 64 |....\Tl)|.l.(..d|
00000160 02 6c 00 7c 15 23 5c 25 2f 7c 03 7c 0c 64 04 20 |.l.|.#\%/|.|.d. |
00000170 03 5c 04 6d 7f 68 70 05 25 ac 65 58 0e 25 1c 26 |.\.m.hp.%.eX.%.&|
00000180 24 cc 27 6c 10 6c 0f 2e cc 27 29 6c 01 dc 05 24 |$.'l.l...')l...$|
00000190 5c 28 ec 15 7c 05 5c 60 5c 59 22 dc 29 22 3c 87 |\(..|.\`\Y".)"<.|
000001a0 7c 5c 12 60 1c 22 dc 27 24 5c 2b 6c 04 68 0f 28 ||\.`.".'$\+l.h.(|
000001b0 7c 01 7c 02 22 cc 2a 10 05 b0 b3 bc 08 24 00 fe ||.|.".*......$..|
000001c0 ff ff 82 fe ff ff 02 00 00 00 00 40 2f 01 00 00 |...........@/...|
000001d0 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

tommcd
March 16th, 2011, 11:48 PM
... after a fresh install of ubuntu 10.10 I cannot boot. All I get is a flashing _ symbol in the top left of the screen like a command prompt

=> No boot loader is installed in the MBR of /dev/sda

Unknown BootLoader on sda2

You have no boot loader on the MBR of your hard drive. That is your problem right there.
Try installing grub2 to the MBR of your hard drive as discussed here: https://help.ubuntu.com/community/Grub2#Reinstalling%20GRUB%202
The first method there that is titled Simplest should be sufficient.

I have no idea what all that stuff after Unknown BootLoader on sda2
means. I have never seen that before in the Boot Info script.

And welcome to the Ubuntu forums!