prisoninmate shares a report from Softpedia: Today, July 20, 2017, is the last day when the Ubuntu 16.10 (Yakkety Yak) was supported by Canonical as the operating system now reached end of life, and it will no longer receive security and software updates. Dubbed by Canonical and Ubuntu founder Mark Shuttleworth as the Yakkety Yak, Ubuntu 16.10 was launched on October 13, 2016, and it was a short-lived release that only received nine (9) months of support through kernel updates, bug fixes, and security patches for various components. Starting today, you should no longer use Ubuntu 16.10 (Yakkety Yak) on your personal computer, even if it's up-to-date. Why? Because, in time, it will become vulnerable to all sort of attacks as Canonical won't provide security and kernel updates for this release. Therefore, all users are urged to upgrade to Ubuntu 17.04 (Zesty Zapus) immediately using the instructions here.