Re: do-release-upgrade 11.04 > 11.10 failing
Did you try what is suggested in that link?
The 11.04 is end of life, it's not supported any more. There is an option but you will have to change the sources.list I think so that it can find the archived packages.
The versions that are not LTS or only supported 18 months so you need to upgrade before that expires. And for servers people usually run only LTS releases and upgrade from one LTS directly to the next one.
Darko.
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Ubuntu 18.04 LTS 64bit
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