cat /etc/update-manager/release-upgrades
# Default behavior for the release upgrader.
[DEFAULT]
# Default prompting behavior, valid options:
#
# never - Never check for a new release.
# normal - Check to see if a new release is available. If more than one new
# release is found, the release upgrader will attempt to upgrade to
# the release that immediately succeeds the currently-running
# release.
# lts - Check to see if a new LTS release is available. The upgrader
# will attempt to upgrade to the first LTS release available after
# the currently-running one. Note that this option should not be
# used if the currently-running release is not itself an LTS
# release, since in that case the upgrader won't be able to
# determine if a newer release is available.
Prompt=lts
cat /etc/apt/sources.list
# deb cdrom:[Ubuntu 17.10 _Artful Aardvark_ - Release amd64 (20180105.1)]/ artful main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu artful main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ artful main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu artful-updates main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ artful-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu artful universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ artful universe
deb http://archive.ubuntu.com/ubuntu artful-updates universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ artful-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://archive.ubuntu.com/ubuntu artful multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ artful multiverse
deb http://archive.ubuntu.com/ubuntu artful-updates multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ artful-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu artful-backports main restricted universe multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ artful-backports main restricted universe multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu artful partner
# deb-src http://archive.canonical.com/ubuntu artful partner
deb http://archive.ubuntu.com/ubuntu artful-security main restricted
# deb-src http://security.ubuntu.com/ubuntu artful-security main restricted
deb http://archive.ubuntu.com/ubuntu artful-security universe
# deb-src http://security.ubuntu.com/ubuntu artful-security universe
deb http://archive.ubuntu.com/ubuntu artful-security multiverse
# deb-src http://security.ubuntu.com/ubuntu artful-security multiverse
sudo apt update
Hit:1 http://ppa.launchpad.net/noobslab/apps/ubuntu artful InRelease
Hit:2 tor+http://deb.torproject.org/torproject.org artful InRelease
Hit:3 http://archive.ubuntu.com/ubuntu artful InRelease
Hit:4 http://packages.microsoft.com/repos/vscode stable InRelease
Hit:5 tor+http://deb.torproject.org/torproject.org obfs4proxy InRelease
Get:6 http://archive.ubuntu.com/ubuntu artful-updates InRelease [88.7 kB]
Hit:7 http://ppa.launchpad.net/rvm/smplayer/ubuntu artful InRelease
Hit:8 http://ppa.launchpad.net/system76/pop/ubuntu artful InRelease
Get:9 http://archive.ubuntu.com/ubuntu artful-backports InRelease [74.6 kB]
Get:10 http://archive.ubuntu.com/ubuntu artful-security InRelease [83.2 kB]
Fetched 247 kB in 2s (110 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
sudo do-release-upgrade -d
Checking for a new Ubuntu release
Upgrades to the development release are only
available from the latest supported release.