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I want to upgrade from 14LTS to 16LTS.

I just tried it now on my 14LTS and received:

 # do-release-upgrade
 Checking for a new Ubuntu release
 No new release found

I’m not quite sure where to possibly start. High-level:

(1)SERVER1 -> (2)HOST1 (uses approx. for a local cache) -> VPN-> (3)REMOTE_UPSTREAM_REPO -> (4)Ubuntu servers

I control/manage (1) and (2), but don’t have access to (3).

Where might the issue be? Probably at (3)? What might I need from them?

I know I’m running 14LTS with the Xenial kernel, but perhaps that doesn’t mean they have all the Xenial repos at (3)?

Pablo Bianchi
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Marco Shaw
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    I'd check in /etc/update-manager/release-upgrades. If it has Prompt=never, change it to Prompt=lts. If the repositories you use do not have Xenial, I doubt there is anything we can do. The obvious thing is to try and find out if that is the case. – mikewhatever Jan 30 '19 at 21:55
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    This may make no difference, but ensure the 14.04 LTS box is fully upgraded (sudo apt dist-upgrade) before attempting do-release-upgrade. fyi: 14.04 LTS (with HWE enabled) uses the 16.04 LTS kernel from 'trusty' archives, not 'xenial'. – guiverc Jan 31 '19 at 00:02
  • Unfortunately, neither worked. I'm going to break off from (3) and set my own local mirror using https://help.ubuntu.com/community/Debmirror. – Marco Shaw Feb 01 '19 at 13:14
  • I did a network trace of the do-release-upgrade command, and came across an HTTP GET for http://changelogs.ubuntu.com/meta-release-lts (https://makandracards.com/makandra/12439-setup-an-ubuntu-mirror-that-enables-local-release-upgrades). I'm probably still going to break off from (3), but this seems to clarify a few things with how (3) might have needed meta-release-lts copied to it. – Marco Shaw Feb 01 '19 at 18:33

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I eventually got it all working with Debmirror, some custom modifications to the meta-release-lts file (see link in comments above), and a separate script to copy the dist-upgrader-all directories/files.

Sorry, I don't have all the steps detailed to post here...

Marco Shaw
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