I have an older Toshiba laptop (about 6 years old) formatted for SUSE 11.2 and Windows XP for dual boot. I want to reformat the hard drive and to install Ubuntu 12.04.3 LTS as the sole operating system. I have an open USB port. I can also use a USB flash drive to load the Ubuntu installation files to either current hard disk partition. I can also use a portable hard disk as the source for installation files. Finally, I could make a DVD which I think the laptop could read. (It will certainly read CDs, but I'm not totally sure about DVDs.)
What should I do?