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I have a dated server running Ubuntu 15.04 that I want to update to a more recent version of Ubuntu.

On logging in, the following message is presented:

New release '16.04.2 LTS' available.
Run 'do-release-upgrade' to upgrade to it.

When I run do-release-upgrade, I am presented with the following message:

An upgrade from 'vivid' to 'xenial' is not supported with this tool.

I checked the contents of the file /etc/update-manager/release-upgrades and verified that upgrades are set to "normal" (i.e. the release upgrader is set to attempt to upgrade to the release that immediately succeeds the currently-running release -- as opposed to never updating or updating only to the next LTS release). Next, I attempted running do-release-upgrade -d to try for a development release. I was presented with the following message:

Checking for a new Ubuntu release
No new release found

The repositories listed in /etc/apt/sources.list are as follows:

deb http://de.archive.ubuntu.com/ubuntu/ vivid main restricted
deb-src http://de.archive.ubuntu.com/ubuntu/ vivid main restricted

deb http://de.archive.ubuntu.com/ubuntu/ vivid-updates main restricted
deb-src http://de.archive.ubuntu.com/ubuntu/ vivid-updates main restricted

deb http://de.archive.ubuntu.com/ubuntu/ vivid universe
deb-src http://de.archive.ubuntu.com/ubuntu/ vivid universe
deb http://de.archive.ubuntu.com/ubuntu/ vivid-updates universe
deb-src http://de.archive.ubuntu.com/ubuntu/ vivid-updates universe

deb http://de.archive.ubuntu.com/ubuntu/ vivid multiverse
deb-src http://de.archive.ubuntu.com/ubuntu/ vivid multiverse
deb http://de.archive.ubuntu.com/ubuntu/ vivid-updates multiverse
deb-src http://de.archive.ubuntu.com/ubuntu/ vivid-updates multiverse

deb http://de.archive.ubuntu.com/ubuntu/ vivid-backports main restricted universe multiverse
deb-src http://de.archive.ubuntu.com/ubuntu/ vivid-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu vivid-security main restricted
deb-src http://security.ubuntu.com/ubuntu vivid-security main restricted
deb http://security.ubuntu.com/ubuntu vivid-security universe
deb-src http://security.ubuntu.com/ubuntu vivid-security universe
deb http://security.ubuntu.com/ubuntu vivid-security multiverse
deb-src http://security.ubuntu.com/ubuntu vivid-security multiverse

What should I do?

EDIT: This is not a duplicate of Can I skip over releases when upgrading? because I want to upgrade to subsequent releases. The solution to How to install software or upgrade from an old unsupported release? seems promising but is not working.

I have changed the repositories listed in /etc/apt/sources.list using the following command:

sudo sed -i -re 's/([a-z]{2}\.)?archive.ubuntu.com|security.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list

This has resulted in the following listing:

deb http://old-releases.ubuntu.com/ubuntu/ vivid main restricted
deb-src http://old-releases.ubuntu.com/ubuntu/ vivid main restricted

deb http://old-releases.ubuntu.com/ubuntu/ vivid-updates main restricted
deb-src http://old-releases.ubuntu.com/ubuntu/ vivid-updates main restricted

deb http://old-releases.ubuntu.com/ubuntu/ vivid universe
deb-src http://old-releases.ubuntu.com/ubuntu/ vivid universe
deb http://old-releases.ubuntu.com/ubuntu/ vivid-updates universe
deb-src http://old-releases.ubuntu.com/ubuntu/ vivid-updates universe

deb http://old-releases.ubuntu.com/ubuntu/ vivid multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ vivid multiverse
deb http://old-releases.ubuntu.com/ubuntu/ vivid-updates multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ vivid-updates multiverse

deb http://old-releases.ubuntu.com/ubuntu/ vivid-backports main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ vivid-backports main restricted universe multiverse

deb http://old-releases.ubuntu.com/ubuntu vivid-security main restricted
deb-src http://old-releases.ubuntu.com/ubuntu vivid-security main restricted
deb http://old-releases.ubuntu.com/ubuntu vivid-security universe
deb-src http://old-releases.ubuntu.com/ubuntu vivid-security universe
deb http://old-releases.ubuntu.com/ubuntu vivid-security multiverse
deb-src http://old-releases.ubuntu.com/ubuntu vivid-security multiverse

Then, apt-get update results in some hits and lots of 404s (with apt-get upgrade when giving the message 0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.). do-release-upgrade, with and without -d results in the same output as before.

When I check on http://old-releases.ubuntu.com/ubuntu/dists/, the latest release I see is Utopic Unicorn 14.10. Where could Vivid Vervet 15.04 be?

What should I do?

BlandCorporation
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