[Bug 1253858] Re: could not calculate the upgrade

[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.


** 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

Status in “ubuntu-release-upgrader” package in Ubuntu:
  Incomplete

Bug description:
  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:

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