Official support for Ubuntu 14.10 "Utopic Unicorn" ended on July 23, 2015. Try upgrading to Ubuntu 15.04 "Vivid Vervet" instead, or wait for Ubuntu 15.10 "Wily Werewolf" to be released on October 22, 2015.
Official support for Ubuntu 14.10 "Utopic Unicorn" ended on July 23, 2015. Try upgrading to Ubuntu 15.04 "Vivid Vervet" instead, or wait for Ubuntu 15.10 "Wily Werewolf" to be released on October 22, 2015.