The release schedule for the upcoming Ubuntu 12.04 LTS operating system has been published on the Ubuntu wiki. The distribution will be released at the end of April 2012.

Note:-codename for Ubuntu 12.04 LTS has not been chosen yet

Ubuntu 12.04 LTS Release Schedule

1St December 2011 - Alpha1

2nd February 2012 - Alpha2

1St March 2012 - Beta1

22nd March 2012 - Beta2

19th April 2012 - Release Candidate

26th April 2012 - Ubuntu 12.04 LTS final