I've previously installed Windows 7 and Windows 8 and both of them in dual boot with Windows 8 bootloader. Then, I installed Ubuntu 13.04 by using Wubi in Windows 8 in a separate partition(E). So, the Windows 8 bootloader have Ubuntu listed automatically. Everything worked fine. I've deleted Windows 8 installation and switched my bootloader to Windows 7 bootmanager. But, I can't get Ubuntu 13.04 to boot. Now, it is installed in drive E and I cannot able to boot it. I've used EasyBCD and also command prompt commands to change the drive letters and paths. But, after doing this error is showing up as:
GRLDR is missing. Press CTRL + ALT + DELETE to restart
Any ideas? How can I install wubi bootloader?