###Here's the comment:
Manually editing `sources.list` and doing `update`, `upgrade`, and `full-upgrade` sometimes manages to upgrade an Ubuntu system to a later release, but it is not a supported, reliable, or safe way to do so. It's also *less* likely to work from an unsupported release, since the differences are greater. It resembles the recommended upgrade procedure in Debian but most Debian releases specify additional actions in their release notes. For Ubuntu, it does not even resemble any recommended procedure. [It is also completely unnecessary, even from an EOL release.](https://a…