Dual Boot - Windows 7/Ubuntu 10.4 - No Windows now after upgrade

[Linux7]

I just did an upgrade from 9.10 to 10.04 and now I can't boot into Windows 7 on this dual boot desktop. I usually do a clean install but with a laptop and desktop a copy of Windows 7 and Ubuntu on each machine it's getting very tiring with 4 os's so opted for the upgrade this time.

During the installation there was a window that game up about upgrading grub and what devices to install it on. The help box was not very complete and seemed to say to click all the check boxes which included the main drive and it's partitions including windows. During the install somewhere it said something like grub could not be installed on one of the devices which I think was sda6 which is probably the Windows 7 partition.

So how would I get the option of booting into Windows 7 on startup as now I only get a blank black screen when I click on the Windows 7 option upon bootup? I hope I don't have to reinstall one or both os's again from scratch as this is becoming to much work to do on two systems every 6 months, especially with the amount of programs I have installed.

Is this a simple fix or can you give me a suggestion on what to do?

Thanks....

[from_au]

Im having same problem i had windows7 but after i nstalled Ubuntu 10.04 i cant get in to windows 7 anymore but im lucky i had backup from my windows 7 and Mbr so i recovered windows 7 and now i cant install ubuntu because of the boot loader probably i will wait for Fedora 13.

[ssican]

Installing the available updates and rebooting will fix this issue.

See this information on PHORONIX website:
"An Ubuntu Incident Report is available on the Ubuntu Wiki:
We had a late discovery of GRUB bootloader bug affecting dual-boot users of Ubuntu. When installing in a dual-boot environment, the other operating system will not appear at first in the GRUB menu. Installing the available updates and rebooting will fix this issue. However, it was determined the day of the release that this is not an optimal solution for new users or those not connected to the Internet."
http://www.phoronix.com/scan.php?pag...item&px=ODE5Ng

Menu entries for GRUB can be re-generated using update-grub.

Updating GRUB After Installation of a New Linux Distribution or Kernel:
Updating GRUB
Updating GRUB to recognize new Linux distributions or kernel images can be done in two ways, automatically and manually.

"The automatic procedure involves executing a simple command which will scan your boot partition for new kernel images and make relevant entries for them in the GRUB configuration file. The command is "update-grub" or "sudo update-grub" depending on your current user permissions"
http://www.brighthub.com/computing/l...les/36648.aspx

[dvlchd3]

@ssican - I believe that was fixed before the ISOs were released. Unless the users got the ISO from an unofficial source, 10.04 was pushed back a couple of hours yesterday to solve this issue:
https://bugs.launchpad.net/ubuntu/+s...ty/+bug/570765

Nonetheless, please do try to run

sudo update-grub

If this does not resolve the issue run:

sudo osprober

and post the output here.

[uzuzjmd]

Followed the instruction
sudo update-grub

julian@julian-desktop:~$ sudo update-grub
Searching for GRUB installation directory ... found: /boot/grub
Searching for default file ... found: /boot/grub/default
Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
Searching for splash image ... none found, skipping ...
Found kernel: /boot/vmlinuz-2.6.32-21-generic-pae
Found kernel: /boot/vmlinuz-2.6.31-20-generic-pae
Found GRUB 2: /boot/grub/core.img
Found kernel: /boot/memtest86+.bin
Updating /boot/grub/menu.lst ... done

no windows found

The output of sudo os-prober is as follows

julian@julian-desktop:~$ sudo os-prober
/dev/sda1:Windows 7 (loader):Windows:chain

what now?

[Spac3man]

dual booting lucid and windows 7

Same problem as uzuzjmd, tried "sudo update-grub" and am still unable to boot windows 7; i get a black screen with flashing underscore... windows does not load.

andrew@andrew-laptop:~$ sudo update-grub
[sudo] password for andrew:
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-2.6.32-21-generic
Found initrd image: /boot/initrd.img-2.6.32-21-generic
Found linux image: /boot/vmlinuz-2.6.31-20-generic
Found initrd image: /boot/initrd.img-2.6.31-20-generic
Found memtest86+ image: /boot/memtest86+.bin
Found Windows 7 (loader) on /dev/sda1
done

andrew@andrew-laptop:~$ sudo os-prober
/dev/sda1:Windows 7 (loader):Windows:chain

what to do?