This question already has an answer here:
Dual boot. I tried with a bootable USB, but my computer still went straight to Windows 8. Then I followed the instruction on its website, tried with a windows-installer http://www.ubuntu.com/download/desktop/install-ubuntu-with-windows But still unable to load Ubuntu, \Ubuntu\winboot\wubildr.mbr
Is there any way I could load Ubuntu correctly? I think something is wrong with my windows boot manager or something like this.