Hey all,
I hope ubuntu site is having some maintanance issues. However, you can download the 12.04 LTS version from this link.
PC (Intel x86) desktop CD and 64-bit PC (AMD64) desktop CD for desktop
PC (Intel x86) server install CD and 64-bit PC (AMD64) server install CD for servers. For more, visit the link in line #1.
http://www.ubuntu.com/download/ubuntu/download is not working. Hope the problem will be fixed soon 
Precise Pagolin got a good review comments and been mentioned as the best under unity. Hope you all will enjoy the Long term support of 5 years