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Ubuntu releases are often referred to using only the adjective portion of the code name, e.g., 'Feisty'. Names are occasionally chosen so that animal appearance or habits reflects some new feature, e.g., 'Koala's favourite leaf is Eucalyptus' see below.

As of Ubuntu 17.10, however, the initial letter 'rolled over' and returned to 'A'. With the exception of the first two releases, code names are in alphabetical order, and except for the first three releases, the first letters are sequential, allowing a quick determination of which release is newer. Ubuntu releases are also given code names, using an adjective and an animal with the same first letter – an alliteration, e.g., 'Dapper Drake'. The support period for non-LTS releases is 9 months. Through the ESM paid option, support can be extended even longer, up to a total of ten years for 18.04. LTS releases 12.04 and newer are freely supported for five years. The desktop version of LTS releases for 10.04 and earlier were supported for three years, with server version support for five years.

Įvery fourth release, occurring in the second quarter of even-numbered years, has been designated as a long-term support (LTS) release. Ĭanonical schedules Ubuntu releases to occur approximately one month after GNOME releases, resulting in each Ubuntu release including a newer version of GNOME. Consequently, version numbers for future versions are provisional if the release is delayed until a different month (or even year) to that planned, the version number will change accordingly. The first Ubuntu release, for example, was Ubuntu 4.10 and was released on 20 October 2004. Ubuntu releases are made semiannually by Canonical Ltd, the developers of the Ubuntu operating system, using the year and month of the release as a version number.

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