Unsupported upgrades
Sometimes do-release-upgrade isn't able to run the upgrade to the latest version and it shows an error similar to this:
An upgrade from 'eoan' to 'focal' is not supported with this tool.
If that happens, you need to download a version-specific upgrader, you can find the link at https://changelogs.ubuntu.com/meta-release.
You need to download the upgrade tool for the version you are upgrading to. For example, if you are upgrading to Ubuntu 20.04 (focal), you'll see the link on that page as follows:
UpgradeTool: http://archive.ubuntu.com/ubuntu/dists/focal-updates/main/dist-upgrader-all/current/focal.tar.gz
The download is an archive which contains an executable with the code name of the release. execute it to run the upgrade tool for that release. Note that the archive extracts everything in the current directory so you might want to create a directory for it to extract into:
# Downloads the upgrader, check the link above for the URL of the file for your release wget http://archive.ubuntu.com/ubuntu/dists/focal-updates/main/dist-upgrader-all/current/focal.tar.gz # Extract it into a new directory mkdir upgrader tar -xaf focal.tar.gz -C upgrader cd upgrader # Run the executable, the name changes based on the release ./focal
This executable works the same as do-release-upgrade. If you still get the error of the upgrade not being supported, you might need to make an intermediate upgrade to an earlier version.
