I installed Windows 7 alongside Ubuntu 14.10 and hence I lost grub. I reinstalled grub using a liveCD and now the Ubuntu boot option only shows Windows 7 and 10s timer after which it'll boot into Windows 7. It doesn't show Ubuntu option. I tried repairing boot using boot-repair tool but no luck.
Here's the boot-repair pastebin: http://paste.ubuntu.com/9834084/