upgrading old releases

[Jared Greenwald]

Does anyone know of a way to perform a do-release-upgrade on an older
(unsupported) install?  I imagine at some point in the past it was
supported to upgrade from 18.10 to 19.04 and from there to a much newer
version.  I've seen articles outlining a way to override the cache file but
it looks like the do-release-upgrade code has overridden that but just
dropping the cache in as a tarball instead of downloading it directly.
Does anyone know of a way around this?

-Jared
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