I'm trying to upgrade from 18.10 to 19.10, using sudo do-release-upgrade
however I only get an error: An upgrade from 'cosmic' to 'eoan' is not supported with this tool.
I performed the steps to update my sources.list
to point to old-release server, as suggested here: How to install software or upgrade from an old unsupported release?
This did not help. I get the same error.
Best Answer
It's still possible to do the upgrade, you just have to hack some files per this blog post in order to upgrade to 19.04 first. I was able to upgrade successfully following his method.
Quoting the blog: