I have made a BOOTABLE USB installation of Ubuntu 13.04 using pendrive linux.
I also have Windows 8 on separate partition. After I finished installing Ubuntu 13.04 from the USB, it went straight to Windows 8 without Grub showing to ask me to select an
operating system, how can i fix this ?
I don't have UEFI or secure boot.
On Windows 8, try EasyBCD, a handy tool that allows you to create a multiboot environment in order to run multiple operating systems on the same computer.
For me it worked.