Multi OS Booting

Recently my brother Robert wanted to have the ability to boot to different Operating Systems, normally I would never entertain such a practice with something so alien, but he is my brother so I conceded to his request reluctantly. There are many ways with which you can accomplish Multi Boot, not least directly from the Installation/LiveCD itself. After installation of any alternative Operating System and before installation of Ubuntu please ensure you "defragment" your OS partition or OS partitions.