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Does superuser follow the same policy as askubuntu to mark new questions about "no-longer supported" operating systems as off-topic?
Short answer: Yes they are on-topic.
We allow all sorts of questions about old (outdated) operating systems.
We may not be able to answer them though ... and you may get people suggesting you should upgrade ...
This question is specific to an end of life Ubuntu release. These are no longer supported and are therefore off-topic here. To upgrade, see: How to install software or upgrade from old unsupported release?