-deb http://security.ubuntu.com/ubuntu trusty-security main restricted
-deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted
-deb http://security.ubuntu.com/ubuntu trusty-security universe
-deb-src http://security.ubuntu.com/ubuntu trusty-security universe
-deb http://security.ubuntu.com/ubuntu trusty-security multiverse
-deb-src http://security.ubuntu.com/ubuntu trusty-security multiverse
+deb http://security.ubuntu.com/ubuntu xenial-security main restricted
+deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted
+deb http://security.ubuntu.com/ubuntu xenial-security universe
+deb-src http://security.ubuntu.com/ubuntu xenial-security universe
+deb http://security.ubuntu.com/ubuntu xenial-security multiverse
+deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse