Ubuntu 16.10, codenamed Yakkety Yak, has stopped receiving support today, nine months after its release. If you are running this release, it's time to upgrade to the newer Ubuntu 17.04.
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Canonical has released Ubuntu 16.10 Yakkety Yak. The release will be supported until July 2017, just nine months away. The release brings minor improvements and includes a Unity 8 tech preview.