Understanding Ubuntu LTS (Long Time Support).

LTS is an abbreviation for “Long Term Support”.
As described in Ubuntu WiKi, Ubuntu Desktop and Ubuntu Server are released every six months. LTS versions are released every 2 years.

In previous releases, a Long Term Support (LTS) version had 3 years support on Desktop version and 5 years on Server version.
Starting with Ubuntu 12.04 LTS, both versions will receive 5 years support.

The LTS designation applies only to specific subsets of the Ubuntu archive.

Some of the latest support windows are illustrated below:

LTS is:
Enterprise Focused
Compatible with New Hardware
More Tested

LTS is not:
A Feature-Based Release
Cutting Edge

LTS Schedule
To ensure stability, a small number of changes to the release schedule is planned:
Reduced Alpha Stage
Two Beta Releases

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