[Bug 1237524] Re: Can not upgrade to 13.10 from 13.04

[Brian Murray]

It is not enough to just disable the PPAs, depending on what PPAs you
had enabled you may actually need to uninstall the ppa version of
packages and install the official Ubuntu ones.  Did you have the xorg-
edger's ppa enabled?  If so there are instructions at the home page for
that ppa regarding how to uninstall packages from it.

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https://bugs.launchpad.net/bugs/1237524

Title:
  Can not upgrade to 13.10 from 13.04

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

Bug description:
  I wanted to do an upgrade from 13.04.

  So I sued this commend

  sudo update-manager -d
  But I got this error

  Could not calculate the upgrade

  
  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

  Then I disabled all ppa's same problem

  you can see this as well
  http://ubuntuforums.org/showthread.php?t=2179674&p=12811773#post12811773

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