[Bug 1743995] Re: Upgrade 17.04 to 17.10 not possible

[Jean-Baptiste Lallement]

@ZdravkoG, my answer was for the original poster of this bug report. In you case it is unexpected to have entries for both xenial and zesty in the same sources.list
Could you please file a separate bug report.  You can do it from the command line with the command:

ubuntu-bug ubuntu-release-upgrader

It's easier to separate issues and it can still be marked as duplicate
if after investigation it appears to be the same.

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https://bugs.launchpad.net/bugs/1743995

Title:
  Upgrade 17.04 to 17.10 not possible

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Expected: Upgrade 17.04 to 17.10

  Result: 
  E:The repository 'http://archive.ubuntu.com/ubuntu stable Release' does not have a Release file.

  Also, Upgrade server has a circular reference
  see http://archive.ubuntu.com/ubuntu/ubuntu/ubuntu/ubuntu/ubuntu/ubuntu/...

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