Today I updated my Ubuntu 9.10 install to Ubuntu Lucid Lynx 10.04 LTS. My machine also dual boots with Windows 7. After I upgraded I came to discover that I could no longer boot into Windows, in fact when I would try to boot to Windows it would just return to the GRUB boot menu. If you are experiencing this issue, feel free to check out these two websites for the answer.
Ubuntu Forum thread that led me to the second site.
http://ubuntuforums.org/showthread.php?p=9204201
http://sourceforge.net/apps/mediawiki/bootinfoscript/index.php?title=Boot_Problems:Boot_Sector
Also, feel free to post any questions in the comments section and I will try to respond.
-Ry
Help! That link is a dead one on sourceforge… i’m stuck with exactly the same problem…
I just went there and it worked for me… Try again… maybe you copied and pasted some characters from the next line or something, or maybe their page was down.