That version is now dead
http://news.softpedia.com/news/ubuntu-17-04-zesty-zapus-has-reached-end-of-life-upgrade-to-ubuntu-17-10-now-519360.shtml
Having 3d party packages installed is the main trouble source.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1726347
Title:
Failed to upgrade from 17.04 to 17.10
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