Fixing Windows/Linux boot after an Ubuntu update (Wubi)
Let me guess it: you arrived here because you installed Ubuntu via Wubi in some Windows box and, after a Linux update, you can no longer boot neither Windows or Linux, right?
First, calm down. The Ubuntu update didn’t know that your MBR had nothing about your Ubuntu “instalation”, then it worked on fixing something but just messed everythig.
To fix this, boot up your computer using a live CD (like the Ubuntu one) and execute the following in a terminal:
sudo apt-get install lilo sudo lilo -M /dev/sda mbr
Voilá! Restart you PC without the Ubuntu disc and everything will work like a charm.
Tip: everytime your Ubuntu installation ask you to update, don’t worry to do so. Just do not forget to execute these commands BEFORE restart your system.