Grub boot loader not loading

Hello every one,
I'm new to kali family i've a small problem i've a Dell laptop pre-installed with ubuntu 12.04and i've resized the partiiton and extracted 50gb space to install kali .I have downloaded 32 bit latest version of kali and made a bootable usb The problem is its booting properly from the usb but during the installation process i get an error "GRUB BOOT LOADER NOT INSTALLED U HAVE TO BOOT MANUALLY WITH VMLINUZ". and i got a warning in the begining after starting the live session as follows "THE INSTALLER KERNEL VERSION DOESNT PEASE REBOOT WITH i486".aNYBODY HELP ME please.

Thanks in advance