Ubuntu 15.10 Wily Werewolf, launched in October, has today reached end-of-life. Users should upgrade to the Ubuntu 16.04.1 to continue to receive security updates through the update manager.
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On April 21 Canonical is due to release its next Ubuntu Long Term Support release, version 16.04 codenamed Xenial Xerus. The major highlight of the release is the introduction of Snaps.