Can't do-release-upgrade -d from 16.04 to 18.04

Question

Tried do-release-upgrade -d on a 16.04 machine today but got

Upgrades to the development release are only 
available from the latest supported release.

Surely LTS to LTS is allowed?

Result of cat /etc/update-manager/release-upgrades is Prompt=lts

15 days is not too long, you can wait for official release. My clean 16.04 LTS says that bionic is available. Check your cat /etc/update-manager/release-upgrades | grep Prompt (my has lts). — N0rbert, Apr 11 '18 at 21:00
@OrganicMarble can you include the output of cat /etc/update-manager/release-upgrades here? This should be working, but something might be amiss on your system specifically preventing you from doing the direct upgrade attempt. — Thomas Ward, Apr 11 '18 at 21:22
What is the output of apt-cache policy ubuntu-release-upgrader-core? — N0rbert, Apr 11 '18 at 21:23
Possible duplicate of How do I upgrade to a newer version of Ubuntu? — N0rbert, Apr 11 '18 at 21:32
This turned out to be a connection problem with a terribly un-informative error message. — Organic Marble, Apr 11 '18 at 21:43

score 4 · Answer 1 · edited Apr 11 '18 at 21:29

4

Remove any files in ~/.cache/update-manager-core/ and try the upgrade process again.

edited Apr 11 '18 at 21:29

Thomas Ward

answered Apr 11 '18 at 21:28

Brian Murray

Thanks for your answer, and have my upvote. This turned out to be a connection problem with a terribly un-informative error message. – Organic Marble Apr 11 '18 at 21:44
Had the same problem, this fixed it for me. Thanks. – Jonas Czech Apr 27 '18 at 15:07

1 Answers1