This was likely a temporary issue, could you try the upgrade again?
2017-05-05 10:00:22,136 DEBUG running doUpdate() (showErrors=True)
2017-05-05 10:05:14,607 ERROR IOError/SystemError in cache.update(): 'W:Failed
to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/universe/source/Sources
404 Not Found [IP: 91.189.88.152 80]
, W:Failed to fetch
http://archive.ubuntu.com/ubuntu/dists/xenial/universe/binary-amd64/Packages
404 Not Found [IP: 91.189.88.152 80]
, W:Failed to fetch
http://archive.ubuntu.com/ubuntu/dists/xenial/universe/binary-i386/Packages
404 Not Found [IP: 91.189.88.152 80]
, E:Some index files failed to download. They have been ignored, or old ones
used instead.'. Retrying (currentRetry: 0)
2017-05-05 10:09:24,921 ERROR IOError/SystemError in cache.update(): 'W:Failed
to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/universe/source/Sources
404 Not Found [IP: 91.189.88.162 80]
, W:Failed to fetch
http://archive.ubuntu.com/ubuntu/dists/xenial/universe/binary-amd64/Packages
404 Not Found [IP: 91.189.88.162 80]
, W:Failed to fetch
http://archive.ubuntu.com/ubuntu/dists/xenial/universe/binary-i386/Packages
404 Not Found [IP: 91.189.88.162 80]
, E:Some index files failed to download. They have been ignored, or old ones
used instead.'. Retrying (currentRetry: 1)
2017-05-05 10:13:35,926 ERROR IOError/SystemError in cache.update(): 'W:Failed
to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/universe/source/Sources
404 Not Found [IP: 91.189.88.162 80]
, W:Failed to fetch
http://archive.ubuntu.com/ubuntu/dists/xenial/universe/binary-amd64/Packages
404 Not Found [IP: 91.189.88.162 80]
, W:Failed to fetch
http://archive.ubuntu.com/ubuntu/dists/xenial/universe/binary-i386/Packages
404 Not Found [IP: 91.189.88.162 80]
, E:Some index files failed to download. They have been ignored, or old ones
used instead.'. Retrying (currentRetry: 2)
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1688526
Title:
unable to upgrade from 14.04 to 16.04.2
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