A linux hosting server is the best choice for you if you are planning to build a web hosting company, small business servers, or simply host your own website at home, since linux dedicated servers have been known to be extremely reliable and rarely crashes so there's less downtime. Among Linux distros, Ubuntu is very well known and well supported. Ubuntu Server 12.04 LTS Precise pangolin has been released announced by canonical in London April 26th 2012 and now support for five years. in addition, Ubuntu Server 12.04 LTS Precise Pangolin now includes support for the Xen Hypervisor (version 4.1.2), Xen Cloud Platform (XCP) packages and XCP OpenStack plug-ins.
I just found a nice,well written article with a lot of screenshots about how to install Ubuntu server 12.04 LTS on Ubuntuguideserver.com and I believe it will be very helpful for you.
Read the full article at Ubuntuserverguide.com