20120426: 12.04    precise
20120824: 12.04.1  precise-polish
20121018: 12.10    quantal
20130214: 12.04.2  precise-hwe-q
20130425: 13.04    raring
20130823: 12.04.3  precise-hwe-r
20131017: 13.10    saucy
20140206: 12.04.4  precise-hwe-s
20140417: 14.04    trusty
20140828: 12.04.5  precise-hwe-t