I updated from Ubuntu 9.10 to 10.04, and after installation, the computer restarted.

When grub loaded, all I get is a screen that says error: symbol 'grub_puts' not found

and a useless grub prompt that looks like grub_rescue>

I've tried reinstalling grub from the livecd (usb drive) following this guide: https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows to no avail.

Sometimes, when I start up from the live usb, linux doesn't recognize the harddrive at all. It's not in the places menu, nor does fdisk list anything.

If anyone can help fix up grub so it recognizes and boots up the two os's I have installed, I'd appreciate it.

Also, I know little about grub, so try and make it easy to understand.