Looking at the release page, I noticed the short life of 13.04. It is only 8 months : April 2013 to January 2014.
Why is the life of 13.04 so short?
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After further browsing, I found this :
The first link tells :
The rationale here is that it’s costing a lot of time to maintain all those releases for 18 months. It’s also causing a lot of load on the SRU team and on developers to ensure that upgrading from one release to the other won’t cause regressions due to fixes being SRUed only to a few releases.