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For those who still use the Ubuntu 15.04 (Vivid vervet) operating system, February 4, 2016 is undoubtedly a very sad day, canonical has stopped the system contains the software library maintenance and support, and stop providing the system kernel with installation packages and security patches. Ubuntu 15.04 is named Vivid Vervet by canonical and Ubuntu's father Mark Shuttleworth, and is a non-lts (long-term support) version that officially provides support for only 9 months.
Ubuntu 15.04 covers the latest versions of Linux Kernel 3.9, Unity 7.3 user interface, startup and service management, Compiz 0.9.12 and important preinstalled apps (including Mozilla Firefox and LibreOffice). Adam Conrad issued a statement last month: "As a non-LTS version, Ubuntu 15.04 has a 9-month support cycle, so this version is close to the end of life and stopped supporting on Thursday, February 4. ”
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Ubuntu Vivid Vervet stopped support on 4th