If you installed the Ubuntu 10.04 over your windows and did not see the grub menu list the windows entry here is a work around.
First hold the shift key or press "esc" while booting to view the grub menu and make sure that windows is not listed as some times the grub screen might move too fast to even view what is listed.
If windows is not listed then boot into the ubutnu.
Open a terminal and type
sudo fdisk -l
It should output something like
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 102400 7 HPFS/NTFS
Partition 1 does not end on cylinder boundary.
/dev/sda2 13 6375 51097600 7 HPFS/NTFS
/dev/sda3 6375 12749 51200000 7 HPFS/NTFS
/dev/sda4 12749 19458 53888001 5 Extended
/dev/sda5 12749 19070 50777088 83 Linux
/dev/sda6 19071 19458 3109888 82 Linux swap / Solaris
The entries that have HPFS/NTFS in the system column are your windows entries.
You can access these drives by clicking on "Places" on the top menubar and the then on the partition you want to mount.
You can download the bootinfo script from
http://sourceforge.net/projects/bootinfoscript/files/bootinfoscript/0.55/boot_info_script055.sh/download?use_mirror=biznetnetworks
Run this script and look at the output, it would tell you in which /dev/sdaX is the windows bootmgr installed. Note that number X down.
In the command prompt type
gksudo gedit /etc/grub.d/40_custom
This should open a text editor with a few lines of text in it. At the end of this file add the following lines
menuentry "Windows" {
root='(hd0,X) {replace X by the number we found above}
chainloader +1
}
Save the file by clicking on save option on the top and close the file.
Now run the following command on the terminal
sudo update-grub
Once the command runs successfully restart your system.
Hold the shift key or press "esc" while the system boots to view the grub menu.
You should see windows listed in the options now.
Move the cursor to windows and press "enter" to boot windows.
If you see the erroe "BOOT MGR MISSING" then press cntrl+alt+delte and come to grub menu again.
Move the cursor to windows option and press "e".
you should see a line that has "root='(hd0,1)'" that we entered previously.
Now press "c" which will take you to "grub>" prompt.
At the "grub>" prompt type "ls"
It will list out all the disks that grub is able to recognize for eg.
(hd0) (hd0,1) )(hd0,2) etc...
Type
ls (hd0,1)
and see what the output is, if it does not display as a NTFS partition or displays the name of your other disks for eg: one of you other windows drives.
try out
ls (hd0,2)
and similarly for all the hard disks present and figure out which ones are your windows drives.
Now type exit which will take you back tou your grub menu.
Again go to windows option press "e"
and change the root=(hd0,X) to which ever new number you have found and press cntrl+X to boot.
This should boot your windows.
Hope this helps.
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