could not calculate the upgrade

[PAUL Carl Rulx Peresson]

it's says: "
An unresolvable problem occurred while calculating the upgrade.

 This can be caused by:
 * Upgrading to a pre-release version of Ubuntu
 * Running the current pre-release version of Ubuntu
 * Unofficial software packages not provided by Ubuntu

If none of this applies, then please report this bug using the command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal."

and no more option after.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: ubuntu-release-upgrader-core 1:0.192.13
ProcVersionSignature: Ubuntu 3.8.0-34.49-generic 3.8.13.12
Uname: Linux 3.8.0-34-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.5
Architecture: amd64
CrashDB: ubuntu
Date: Thu Nov 21 20:35:01 2013
InstallationDate: Installed on 2013-02-13 (281 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to raring on 2013-11-22 (0 days ago)
VarLogDistupgradeTermlog:

[Seth Arnold (seth-arnold)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. We appreciate the difficulties you are facing, but this appears to be a "regular" (non-security) bug. I have unmarked it as a security issue since this bug does not show evidence of allowing attackers to cross privilege boundaries nor directly cause loss of data/privacy. Please feel free to report any other bugs you may find.

[Brian Murray (brian-murray)]

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.

[Launchpad Janitor (janitor)]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no activity for 60 days.]