Ubuntu technical board decided to shorten the support window for the 'between LTS' releases from 18 to 9 months starting from 13.04. http://www.theregister.co.

Ubuntu technical board decided to shorten the support window for the 'between LTS' releases from 18 to 9 months starting from 13.04. http://www.theregister.co.uk/2013/03/24/ubuntu_reduces_support_times/ http://www.theregister.co.uk/2013/03/24/ubuntu_reduces_suppo... Number theory not required.