I had dual boot ubuntu 11.10 AND WIN 7. My boot loader used to be windows WUBI, yet after lousy partitioning error by me, my ubuntu crashed and wouldn't start at startup and says somthing about wubildr.mbr file missing. I just installed the new 12.04 from live USB. Formatted the ubuntu drive and converted it to ext4 and was hoping that the GRUB takes over but nothing happened. Still the same error. The Install recognizes the 12.04 installation but i can't boot it. Still the windows boot loader error screen. What should I do now?
closed as too localized by RolandiXor♦, fossfreedom♦ Dec 30 '12 at 9:38
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You should download a gParted live CD or live USB, and try to see what happens. If your partitions are good or not. You should also type the name of your missing file on google, to see if you can recover it. When it's about mbr, it's quite dangerous because it affects both Windows and GNU/Linux.
So first : Check your disks with a live gParted. Maybe you have errors on it that you don't see with your install with Ubuntu. If it doesn't solve the problem try to reinstall GRUB. Maybe it will fix your mbr. But quite not sure.