[How-to] Upgrade to Ubuntu 13.04 "Raring Ringtail" from Ubuntu 12.10 Right Now!

Yeah that's right, Ubuntu 12.10 is now upgradable to latest Ubuntu 13.04 "Raring Ringtail" release. And Ubuntu 13.04 is pretty stable for a beta-quality OS, though I still won't/can't recommend it for production machines. I have been using it in my netbook from the early alpha releases and it has come together pretty nicely. It is even a little more snappier already ...