I have a dual boot system with two hard drives -- one for Windows 7 and the other for Ubuntu (now 3.5.0-43). I ran the most recent Ubuntu updates and lost my Windows 7 entry in grub. I've attempted running
sudo update-grub2, os-prober, manually adding the "40_custom" entry in /etc/grub.d/, and surfing around for a solution. So far, it seems that nobody else has solved this problem.
I ran boot-repair and created the paste link -- http://paste.ubuntu.com/6466121/. Another oddity is that I am not able to do anything other than generate the "BootInfo" using boot-repair. I only get the "About", "Quit", and "Create a BootInfo summary (to get help by email or forum)" when I run the application.
I appreciate any information for how I might be able to re-add this entry... and how I can prevent future updates/upgrades from breaking this configuration again.