EasyBCD will help you get a dual-boot working from the W7 boot manager's side.
You already have a working dual-boot (presumably from grub as the controlling boot manager), so using EasyBCD won't achieve anything you can't already do.
It has no effect on anything inside Linux. It's a Window .NET app that will modify the Vista/7/8 BCD according to your instructions. Once you're inside any of the OSs in your multi-boot, it is completely inactive and won't change the way any of them run.
If you are having problems with Ubuntu, you need to seek help in one of their forums.