Comment 5 for bug 1511783

This bug was fixed in the package ubuntu-release-upgrader - 1:16.04.3

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ubuntu-release-upgrader (1:16.04.3) xenial; urgency=medium

  * DistUpgrade/DistUpgradeController.py: if a BaseMetaPkg has no origins,
    because an Ubuntu mirror has been deactivated, then create a useful
    sources.list file that parallels the one for the deactivated mirror.
    (LP: #1511783)
  * utils/update_mirrors.py: Instead of just appending new mirrors to the
    mirrors.cfg file also remove mirrors that are no longer valid.
    (LP: #1463680)

 -- Brian Murray <email address hidden> Wed, 18 Nov 2015 11:05:19 -0800