on windows 8 preinstalled laptop(uefi) i tried to dual boot it with ubuntu 13.10 64 bit after installation grub did not appear. then i installed easyBCD on windows 8 then i tried to dual boot ubuntu with windows it didnot work. then accidentally i changed the boot location from c drive to \boot then none of the os run properly. i can easyly format my computer and load ubuntu into it but i have to save the costly windows 8 original version.please reply asap!!!
There are at least two relatively easy solutions to this problem:
In both cases, it's best if you disable Secure Boot before trying. Although Ubuntu officially supports Secure Boot, there are a lot of problems with it. Also, rEFInd works with Secure Boot only if you jump through extra hoops.
If neither of these solutions works, post back with the URL that Boot Repair provides. That will give us a better idea of how your system is currently set up.