[Bug 1242592] [NEW] Cannot upgrade from kubuntu 13.04 to 13.10 it shows "Error could not calculate the upgrade"

[Seng]

Public bug reported:

Though Kubuntu 13.10 is released but during upgrade it shows an error
"Could not calculate the upgrade An unresolvable problem occurred while
calculating the upgrade. This can be caused by: * Upgrading to pre-
release version of Ubuntu * Running the current pre-release 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-code' in a terminal."

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1242592

Title:
  Cannot upgrade from kubuntu 13.04 to 13.10 it shows "Error could not
  calculate the upgrade"

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

Bug description:
  Though Kubuntu 13.10 is released but during upgrade it shows an error
  "Could not calculate the upgrade An unresolvable problem occurred
  while calculating the upgrade. This can be caused by: * Upgrading to
  pre-release version of Ubuntu * Running the current pre-release 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-code' in a terminal."

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