I might suggest Debian, instead of Ubuntu. Yes, Ubuntu is based on Debian but is almost no longer the same. Ubuntu has a lot of entitled whiners wanting instant answers to a lot of questions, which is fine, perhaps they learn in their own way - by getting handouts; however Debian is and ever shall be stable.
It might not work on the very latest hardware, but it is just interesting enough to be able to use quickly, has loads of support, and (almost) anything you learn on that system will translate over to Ubuntu if you ever need to go that route.
I'm sure someone will come in with something else (Suse, Fedora, Mint, Arch [lol]), but for the largest support network, and cross-help availability - go Debian.
Installation is easy, via Live DVD or (the preferred) Net-Install. It also supports the most hardware, unlike Ubuntu which has dropped support for a lot of older hardware. Since APT and synaptic front-end works on most/all Debian based releases, installing software will be easy if you go exploring with other distros.
If you want Ubuntu, by all means, it's easy to install and will do everything for you. I personally can't stand the Unity interface and would recommend anything else, Xubuntu being my favorite.
Other Distros such as Arch, and Ubuntu 14 support the latest mainstream hardware, if you need options for that. All my 10-15 year old machines run Debian with no problems. My 6-Core AMD desktop runs Debian x64, and I have a laptop running Xubuntu because I'm too lazy to change it.
If you have more specific questions, please ask away!