Hi all.. i have a HP computer( 160GB SATA, 1 GB RAM ) on which i intially installed solaris 10 and then Ubuntu 9.10 as dual boot. The moment i installed the Ubuntu i was not able to access solaris at all.. the problem being the solaris 10 is not been listed in the ubuntu grub menu.. i tried going to all possible websites.. but still in vain. Most of the sites advise to update the menu.lst file in the ubuntu.. however i have no idea how and what has to be updated in the menu.lst file. This is how things are installed in my system

/dev/sda1 – xfs file system – / ( mount point ) size 76.30 Gigs
/dev/sda2 – unknown file system ( this is where solaris is installed ) – no mount point – size 72.75 gigs.

This is what i found in one of the sites.. but this does not work.. when i update it and check the grub menu it does not show up on the grub.

titleSolaris 10
root(hd0,2)
chainloader+1
makeactive
boot

my menu.lst file is as follows.

### 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=35f25d9f-c766-4ecc-82a9-5a4e624ca7df ro

## default grub root device
## e.g. groot=(hd0,0)
# groot=35f25d9f-c766-4ecc-82a9-5a4e624ca7df

## 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 ##

titleUbuntu 9.10, kernel 2.6.31-20-generic-pae
uuid35f25d9f-c766-4ecc-82a9-5a4e624ca7df
kernel/boot/vmlinuz-2.6.31-20-generic-pae root=UUID=35f25d9f-c766-4ecc-82a9-5a4e624ca7df ro quiet splash
Initrd/boot/initrd.img-2.6.31-20-generic-pae

titleUbuntu 9.10, kernel 2.6.31-20-generic-pae (recovery mode)
uuid35f25d9f-c766-4ecc-82a9-5a4e624ca7df
kernel/boot/vmlinuz-2.6.31-20-generic-pae root=UUID=35f25d9f-c766-4ecc-82a9-5a4e624ca7df ro single
initrd/boot/initrd.img-2.6.31-20-generic-pae

titleChainload into GRUB 2
root35f25d9f-c766-4ecc-82a9-5a4e624ca7df
kernel/boot/grub/core.img

titleUbuntu 9.10, memtest86+
uuid35f25d9f-c766-4ecc-82a9-5a4e624ca7df
kernel/boot/memtest86+.bin

titleSolaris 10
root(hd0,2)
chainloader+1
makeactive
boot

### END DEBIAN AUTOMAGIC KERNELS LIST

i would like to have both ubuntu 9.10 and solaris 10 on my system in dual boot … pls help! Any help with regards to this is Much appreciated. If possible pls reply your answer with the menu.lst file mentioned above so that i can try it on my system. A million thanks for your response!!!!
guys.. also i forgot to mention i would like to boot frm my partition and not from a Virtual drive.

The best way to use a multi boot system is to use a virtual managements system like Virtual box then you can use any and all operating system at the same time just like jumping from one window to another window

Check out this websites
http://www.virtualbox.org