It seems there was an error communicating with your mirror of the Ubuntu
archive:
2013-11-21 20:32:52,077 ERROR IOError/SystemError in cache.update(): 'W:GPG
error: http://deb.opera.com stable Release: The following signatures couldn't
be verified because the public key is not available: NO_PUBKEY
E585066A30C18A2B, W:GPG error: http://deb.opera.com stable Release: The
following signatures couldn't be verified because the public key is not
available: NO_PUBKEY E585066A30C18A2B, W:Failed to fetch
http://ht.archive.ubuntu.com/ubuntu/dists/saucy/Release.gpg Something wicked
happened resolving 'ht.archive.ubuntu.com:http' (-11 - System error)
, W:Failed to fetch
http://security.ubuntu.com/ubuntu/dists/saucy-security/Release.gpg Something
wicked happened resolving 'security.ubuntu.com:http' (-11 - System error)
, W:Failed to fetch http://archive.canonical.com/ubuntu/dists/saucy/Release.gpg
Something wicked happened resolving 'archive.canonical.com:http' (-11 - System
error)
, E:Some index files failed to download. They have been ignored, or old ones
used instead.'. Retrying (currentRetry: 0)
Please try the upgrade again after verifying your network connection or
with a different mirror.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1253858
Title:
could not calculate the upgrade
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