LTS is an abbreviation for “Long Term Support”.
We issue a new desktop and server release every six months. That means you'll always have the latest and greatest applications that the open source world has to offer. Ubuntu is designed with security in mind. You get free security updates for at least 18 months on the desktop and server.
A new LTS version is released every 2 years. With the Long Term Support (LTS) version you get 3 years support on the desktop, and 5 years on the server. There is no extra fee for the LTS version, we make our very best work available to everyone on the same free terms. Upgrades to new versions of Ubuntu are and always will be free of charge.
The two LTS releases so far are DapperDrake and HardyHeron. The next LTS release will be 10.04, released in April 2010, which has yet to be assigned a name.
We regularly review each release during the development cycle, keeping
an eye on the work that our upstreams are doing. From time to time,
this work reaches a natural rest point resulting in a particularly
stable release. For these releases, Canonical makes a commercial
commitment to provide support for a longer term and these become known
as "LTS" releases.
Since KDE 4 is a major change to the platform, it is not currently at
one of these natural rest points so would not be suitable for long
term support. Instead, due to the very high interest, development
efforts will be directed towards KDE 4 and releasing Kubuntu 8.04 with
the option of using either KDE 3.5 or KDE 4.
Users currently running Kubuntu 6.06 will be able to upgrade through
the usual path to Kubuntu 8.04, keeping to the KDE 3.5 release series,
and will receive the usual 18 months of support for that
release. Future Kubuntu releases are likely to be based on the KDE 4
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