Ubuntu – 16.04 LTS to 18.04.1 LTS upgrade: No new release found


I can't get the 16.04 LTS to 18.04.1 LTS upgrade to work, I'm running server.

My current version:

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.5 LTS
Release:    16.04
Codename:   xenial

However despite 18.04.1 being released on the 26th of July, at present on the 31st I'm still being informed that there is no new release?

My /etc/update-manager/release-upgrades file is:

# Default behavior for the release upgrader.

# 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.

And the output of do-release-upgrade:

Checking for a new Ubuntu release
No new release found.

Update manager core is already installed:

sudo apt install update-manager-core
Reading package lists... Done
Building dependency tree       
Reading state information... Done
update-manager-core is already the newest version (1:16.04.13).
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.

Note that this question is distinct to the one here Should I be offered the option to upgrade to 18.04.1? as that question deals with a GUI/desktop based situation whereas this specifically addresses the issue from a terminal / server angle.

Best Answer

Upgrades from 16.04 LTS will not be enabled until a few days after 18.04.1's release expected in early August. https://wiki.ubuntu.com/BionicBeaver/ReleaseSchedule