~$ cat /etc/apt/sources.list | grep -i universe
# deb cdrom:[Kubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main multiverse restricted universe
## universe WILL NOT receive any review or updates from the Ubuntu security
deb http://es.archive.ubuntu.com/ubuntu/ xenial universe
# deb-src http://es.archive.ubuntu.com/ubuntu/ xenial universe
deb http://es.archive.ubuntu.com/ubuntu/ xenial-updates universe
# deb-src http://es.archive.ubuntu.com/ubuntu/ xenial-updates universe
deb http://es.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
# deb-src http://es.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu xenial-security universe
# deb-src http://security.ubuntu.com/ubuntu xenial-security universe