➜ cat /etc/lsb-release
DISTRIB_ID=neon
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="KDE neon User Edition 5.12"

➜ cat /etc/apt/sources.list | grep "deb http://ca.ar"
deb http://ca.archive.ubuntu.com/ubuntu/ xenial main restricted
deb http://ca.archive.ubuntu.com/ubuntu/ xenial-updates main restricted
deb http://ca.archive.ubuntu.com/ubuntu/ xenial universe
deb http://ca.archive.ubuntu.com/ubuntu/ xenial-updates universe
deb http://ca.archive.ubuntu.com/ubuntu/ xenial multiverse
deb http://ca.archive.ubuntu.com/ubuntu/ xenial-updates multiverse
deb http://ca.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse

➜ sudo do-release-upgrade
Checking for a new Ubuntu release
No new release found.

➜ sudo do-release-upgrade -d
Checking for a new Ubuntu release
Upgrades to the development release are only
available from the latest supported release.