[Bug 1609553] [NEW] do-release-upgrade to 16.04.1 fails with 404

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I am running  Ubuntu 14.04.5 LTS, installed on VirtualBox.  When I log
in, it notifies me:

New release '16.04.1 LTS' available.
Run 'do-release-upgrade' to upgrade to it.

When I sudo do-release-upgrade, it eventually fails with errors:

Err http://us.archive.ubuntu.com xenial/universe Sources
  404  Not Found [IP: 91.189.91.23 80]
Err http://us.archive.ubuntu.com xenial/universe amd64 Packages
  404  Not Found [IP: 91.189.91.23 80]

And then aborts the upgrade


I reproduced this bug on a perfectly clean system (again on VirtualBox) by installing from ubuntu-14.04.4-server-amd64.iso, running "sudo apt update"/"sudo apt upgrade", and then rebooting and running "do-release-update".

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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do-release-upgrade to 16.04.1 fails with 404
https://bugs.launchpad.net/bugs/1609553
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