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Old 11-07-2009, 10:52 AM   #1
zzyzx1
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OVER MY HEAD - Choosing the right partition to boot from, Grub?


Will try and keep short and on point. Ive been using Ubuntu and decided to load Mint and give it a try. Simple install, but i chose the "load along side Ubuntu" option and on a separate partition. So i used the partition tool to resize the hd into 2 equal parts and loaded Mint on the new partition "along side" next to Ubuntu.

I was hoping to reboot and find some kind of friendly splash asking me which OS to boot into, Mint or Ubuntu but it just goes right into Ubuntu. So i checked GParted to make sure that my new part was flagged for boot and it was not, so i changed it, still wont boot from Mint.

So now Im looking at Grub. I don't know much about Grub so I am RTFM and looking for any assistance to help me figure this out. The result I am looking for is a choice at boot up. Ubuntu or Mint.

Thank you!
 
Old 11-07-2009, 11:12 AM   #2
{BBI}Nexus{BBI}
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Post the contents of your /boot/grub/menu.lst file to this thread.
 
Old 11-07-2009, 11:14 AM   #3
AwesomeMachine
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Run the command:

update-grub

from Ubuntu, and it should put the new installation on the boot menu.
 
Old 11-07-2009, 11:20 AM   #4
zzyzx1
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Quote:
Originally Posted by AwesomeMachine View Post
Run the command:

update-grub

from Ubuntu, and it should put the new installation on the boot menu.
zzyzx1-desktop:~$ update-grub
debconf: DbDriver "passwords" warning: could not open /var/cache/debconf/passwords.dat: Permission denied
Searching for GRUB installation directory ... found: /boot/grub
/dev/sda1: error opening volume
/dev/sda1: error opening volume
Searching for default file ... found: /boot/grub/default
Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
cp: cannot remove `/boot/grub/menu.lst~': Permission denied
 
Old 11-07-2009, 11:26 AM   #5
Robhogg
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Quote:
Originally Posted by zzyzx1 View Post
zzyzx1-desktop:~$ update-grub
debconf: DbDriver "passwords" warning: could not open /var/cache/debconf/passwords.dat: Permission denied...
Try sudo update-grub - root privileges will be needed to do that.

However, I don't think that will give you a choice of operating systems. You'll need to add an entry to the menu.lst file (Linux distro installers seem to focus on dual-booting with Windows, and ignore other Linux installations).

To find the partition names in grub-speak, you can use the grub shell:
Code:
rob@rob-laptop:~$ grub
grub>find /boot/grub/menu.lst
 (hd0,0)
 (hd0,5)
grub> quit
This tells me that on my system I have two installations (on /dev/sda1 and /dev/sda6). Add an entry similar to the following to the menu.lst file of the Ubuntu installation:
Code:
title		Mint Linux
root		(hd0,5)
kernel		/boot/vmlinuz-2.6.26-2-686 root=UUID=da163fed-6108-47d0-a707-d0aae3620111 ro quiet
initrd		/boot/initrd.img-2.6.26-2-686
Of cours, the initrd and vmlinuz names will have to be substituted with the ones from the Mint installations. The UUID can be found using vol_id:
Code:
rob@rob-laptop:~$ sudo vol_id --uuid /dev/sda6
da163fed-6108-47d0-a707-d0aae3620111
... though I think you could also use the name of the root partition in Linux speak (i.e. root=/dev/sda6).

Alternatively, you could just copy the menu.lst entry from the file in the Mint installations /boot/grub.

Last edited by Robhogg; 11-07-2009 at 11:58 AM.
 
Old 11-07-2009, 11:26 AM   #6
zzyzx1
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Quote:
Originally Posted by {BBI}Nexus{BBI} View Post
Post the contents of your /boot/grub/menu.lst file to this thread.
# menu.lst - See: grub(8), info grub, update-grub(8)
# grub-install(8), grub-floppy(8),
# grub-md5-crypt, /usr/share/doc/grub
# and /usr/share/doc/grub-doc/.

## default num
# Set the default entry to the entry number NUM. Numbering starts from 0, and
# the entry number 0 is the default if the command is not used.
#
# You can specify 'saved' instead of a number. In this case, the default entry
# is the entry saved with the command 'savedefault'.
# WARNING: If you are using dmraid do not use 'savedefault' or your
# array will desync and will not let you boot your system.
default 0

## timeout sec
# Set a timeout, in SEC seconds, before automatically booting the default entry
# (normally the first entry defined).
timeout 3

## hiddenmenu
# Hides the menu by default (press ESC to see the menu)
#hiddenmenu

# Pretty colours
#color cyan/blue white/blue

## password ['--md5'] passwd
# If used in the first section of a menu file, disable all interactive editing
# control (menu entry editor and command-line) and entries protected by the
# command 'lock'
# e.g. password topsecret
## password --md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/
# password topsecret

#
# examples
#
# title Windows 95/98/NT/2000
# root (hd0,0)
# makeactive
# chainloader +1
#
# title Linux
# root (hd0,1)
# kernel /vmlinuz root=/dev/hda2 ro
#

#
# Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST

### BEGIN AUTOMAGIC KERNELS LIST
## lines between the AUTOMAGIC KERNELS LIST markers will be modified
## by the debian update-grub script except for the default options below

## DO NOT UNCOMMENT THEM, Just edit them to your needs

## ## Start Default Options ##
## default kernel options
## default kernel options for automagic boot options
## If you want special options for specific kernels use kopt_x_y_z
## where x.y.z is kernel version. Minor versions can be omitted.
## e.g. kopt=root=/dev/hda1 ro
## kopt_2_6_8=root=/dev/hdc1 ro
## kopt_2_6_8_2_686=root=/dev/hdc2 ro
# kopt=root=UUID=c1fac2bc-2156-482f-9249-79b3854acfc0 ro

## default grub root device
## e.g. groot=(hd0,0)
# groot=c1fac2bc-2156-482f-9249-79b3854acfc0

## should update-grub create alternative automagic boot options
## e.g. alternative=true
## alternative=false
# alternative=true

## should update-grub lock alternative automagic boot options
## e.g. lockalternative=true
## lockalternative=false
# lockalternative=false

## additional options to use with the default boot option, but not with the
## alternatives
## e.g. defoptions=vga=791 resume=/dev/hda5
# defoptions=quiet splash

## should update-grub lock old automagic boot options
## e.g. lockold=false
## lockold=true
# lockold=false

## Xen hypervisor options to use with the default Xen boot option
# xenhopt=

## Xen Linux kernel options to use with the default Xen boot option
# xenkopt=console=tty0

## altoption boot targets option
## multiple altoptions lines are allowed
## e.g. altoptions=(extra menu suffix) extra boot options
## altoptions=(recovery) single
# altoptions=(recovery mode) single

## controls how many kernels should be put into the menu.lst
## only counts the first occurence of a kernel, not the
## alternative kernel options
## e.g. howmany=all
## howmany=7
# howmany=all

## specify if running in Xen domU or have grub detect automatically
## update-grub will ignore non-xen kernels when running in domU and vice versa
## e.g. indomU=detect
## indomU=true
## indomU=false
# indomU=detect

## should update-grub create memtest86 boot option
## e.g. memtest86=true
## memtest86=false
# memtest86=true

## should update-grub adjust the value of the default booted system
## can be true or false
# updatedefaultentry=false

## should update-grub add savedefault to the default options
## can be true or false
# savedefault=false

## ## End Default Options ##

title Ubuntu 9.04, kernel 2.6.28-16-generic
uuid c1fac2bc-2156-482f-9249-79b3854acfc0
kernel /boot/vmlinuz-2.6.28-16-generic root=UUID=c1fac2bc-2156-482f-9249-79b3854acfc0 ro quiet splash
initrd /boot/initrd.img-2.6.28-16-generic
quiet

title Ubuntu 9.04, kernel 2.6.28-16-generic (recovery mode)
uuid c1fac2bc-2156-482f-9249-79b3854acfc0
kernel /boot/vmlinuz-2.6.28-16-generic root=UUID=c1fac2bc-2156-482f-9249-79b3854acfc0 ro single
initrd /boot/initrd.img-2.6.28-16-generic

title Ubuntu 9.04, kernel 2.6.28-15-generic
uuid c1fac2bc-2156-482f-9249-79b3854acfc0
kernel /boot/vmlinuz-2.6.28-15-generic root=UUID=c1fac2bc-2156-482f-9249-79b3854acfc0 ro quiet splash
initrd /boot/initrd.img-2.6.28-15-generic
quiet

title Ubuntu 9.04, kernel 2.6.28-15-generic (recovery mode)
uuid c1fac2bc-2156-482f-9249-79b3854acfc0
kernel /boot/vmlinuz-2.6.28-15-generic root=UUID=c1fac2bc-2156-482f-9249-79b3854acfc0 ro single
initrd /boot/initrd.img-2.6.28-15-generic

title Ubuntu 9.04, kernel 2.6.28-14-generic
uuid c1fac2bc-2156-482f-9249-79b3854acfc0
kernel /boot/vmlinuz-2.6.28-14-generic root=UUID=c1fac2bc-2156-482f-9249-79b3854acfc0 ro quiet splash
initrd /boot/initrd.img-2.6.28-14-generic
quiet

title Ubuntu 9.04, kernel 2.6.28-14-generic (recovery mode)
uuid c1fac2bc-2156-482f-9249-79b3854acfc0
kernel /boot/vmlinuz-2.6.28-14-generic root=UUID=c1fac2bc-2156-482f-9249-79b3854acfc0 ro single
initrd /boot/initrd.img-2.6.28-14-generic

title Ubuntu 9.04, kernel 2.6.28-13-generic
uuid c1fac2bc-2156-482f-9249-79b3854acfc0
kernel /boot/vmlinuz-2.6.28-13-generic root=UUID=c1fac2bc-2156-482f-9249-79b3854acfc0 ro quiet splash
initrd /boot/initrd.img-2.6.28-13-generic
quiet

title Ubuntu 9.04, kernel 2.6.28-13-generic (recovery mode)
uuid c1fac2bc-2156-482f-9249-79b3854acfc0
kernel /boot/vmlinuz-2.6.28-13-generic root=UUID=c1fac2bc-2156-482f-9249-79b3854acfc0 ro single
initrd /boot/initrd.img-2.6.28-13-generic

title Ubuntu 9.04, kernel 2.6.28-11-generic
uuid c1fac2bc-2156-482f-9249-79b3854acfc0
kernel /boot/vmlinuz-2.6.28-11-generic root=UUID=c1fac2bc-2156-482f-9249-79b3854acfc0 ro quiet splash
initrd /boot/initrd.img-2.6.28-11-generic
quiet

title Ubuntu 9.04, kernel 2.6.28-11-generic (recovery mode)
uuid c1fac2bc-2156-482f-9249-79b3854acfc0
kernel /boot/vmlinuz-2.6.28-11-generic root=UUID=c1fac2bc-2156-482f-9249-79b3854acfc0 ro single
initrd /boot/initrd.img-2.6.28-11-generic

title Ubuntu 9.04, memtest86+
uuid c1fac2bc-2156-482f-9249-79b3854acfc0
kernel /boot/memtest86+.bin
quiet

### END DEBIAN AUTOMAGIC KERNELS LIST
 
Old 11-07-2009, 11:59 AM   #7
zzyzx1
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"Mint installations /boot/grub."

OK, so this was the path i was heading towards before i cried out for help. So if i go to Mint installations /boot/grub and copy that info i should go back to Ubuntu Grub and paste that menu.lst? and which order?

This is the part that is confusing me... thx.
 
Old 11-07-2009, 12:08 PM   #8
yancek
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You installed Mint Grub to the root partition of Mint so you just need to copy the first Mint entry from its /boot/grub/menu.lst to the Ubuntu /boot/grub/menu.lst. Don't copy the whole file. Is your Mint partition mounted? can you see the Mint files from Ubuntu? If you can't post back with the output of "sudo fdisk -l" listing your partition information.
 
Old 11-07-2009, 12:09 PM   #9
zzyzx1
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I noticed that the Mint menu.lst has the Mint OS loaded under "default" and has the Ubuntu loaded under "automagic kernel"

So can i just put Mint's menu.lst in Ubuntu's /boot/grub ??
 
Old 11-07-2009, 12:13 PM   #10
zzyzx1
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"sudo fdisk -l"

Yes, the Mint partition mounts (when i double click the drive) from Ubunto. But I dont thing its mounting on boot and therefore unrecognised at startup. /dev/sda6 is MINT OS.


Disk /dev/sda: 61.4 GB, 61492838400 bytes
255 heads, 63 sectors/track, 7476 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xea1aa9c7

Device Boot Start End Blocks Id System
/dev/sda1 1 3648 29302528+ 83 Linux
/dev/sda2 3649 7476 30748410 5 Extended
/dev/sda5 7292 7476 1485981 82 Linux swap / Solaris
/dev/sda6 * 3649 7135 28009264+ 83 Linux
/dev/sda7 7136 7291 1253038+ 82 Linux swap / Solaris

Partition table entries are not in disk order

Disk /dev/sdb: 30.7 GB, 30750031872 bytes
255 heads, 63 sectors/track, 3738 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x9dc96e9e

Device Boot Start End Blocks Id System
/dev/sdb1 1 4 32098+ de Dell Utility
/dev/sdb2 5 3738 29993355 7 HPFS/NTFS
 
Old 11-07-2009, 12:32 PM   #11
zzyzx1
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CONFIRMED- I chose the MINT OS at boot and it errors with "Partition not recognized" How do i get the partition to boot..??

Thanx.
 
Old 11-07-2009, 04:25 PM   #12
Robhogg
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Quote:
Originally Posted by zzyzx1 View Post
CONFIRMED- I chose the MINT OS at boot and it errors with "Partition not recognized" How do i get the partition to boot..??
There might be a problem with the Mint partition, by the sound of it. Have you tried scanning it with fsck from Ubuntu?
Code:
sudo e2fsck -cvf /dev/sda6
 
Old 11-08-2009, 01:20 PM   #13
yancek
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What is your Mint entry in the Ubuntu menu.lst file (you are still booting from Ubuntu)? should start with root (hd0,5).

You should be able to boot with this:

title Linux Mint
root (hd0,5)
chainloader +1
 
  


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