Once installation is done, I restarted, but was greeted with an error "invalid arch independent ELF magic". Searching this up indicated that grub was probably from a former Model of ubuntu,and really should be installed again. I needed to boot from the liveCD/USB all over again, and reinstall grub2 (you http://knoxeoyfn.digiblogbox.com/16285760/a-simple-key-for-windows-7-format-hard-drive-exfat-unveiled