[Bug 1448163] [NEW] Cannot upgrade from Ubuntu 14.10 to 15.04

[Rado Buransky]

Public bug reported:

sudo do-release-upgrade
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [198 B]
Get:2 Upgrade tool [1 221 kB]

....

Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Building data structures... Done

Calculating the changes

Calculating the changes

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

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

Restoring original system state

Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
Building data structures... Done

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: ubuntu-release-upgrader-core 1:14.10.10
ProcVersionSignature: Ubuntu 3.16.0-34.47-generic 3.16.7-ckt8
Uname: Linux 3.16.0-34-generic x86_64
ApportVersion: 2.14.7-0ubuntu8.4
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Fri Apr 24 16:18:44 2015
InstallationDate: Installed on 2014-08-01 (265 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to utopic on 2015-04-24 (0 days ago)

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


** Tags: amd64 apport-bug dist-upgrade utopic

** Description changed:

  sudo do-release-upgrade
- sudo do-release-upgrade 
  Checking for a new Ubuntu release
- Get:1 Upgrade tool signature [198 B]                                                                                                                                                     
- Get:2 Upgrade tool [1 221 kB] 
+ Get:1 Upgrade tool signature [198 B]
+ Get:2 Upgrade tool [1 221 kB]
  
  ....
  
  Checking package manager
- Reading package lists... Done    
- Building dependency tree          
+ Reading package lists... Done
+ Building dependency tree
  Reading state information... Done
- Building data structures... Done 
+ Building data structures... Done
  
  Calculating the changes
  
  Calculating the changes
  
  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 
+ 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. 
- 
+ If none of this applies, then please report this bug using the
+ command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.
  
  Restoring original system state
  
  Aborting
- Reading package lists... Done    
- Building dependency tree          
+ Reading package lists... Done
+ Building dependency tree
  Reading state information... Done
  Building data structures... Done
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: ubuntu-release-upgrader-core 1:14.10.10
  ProcVersionSignature: Ubuntu 3.16.0-34.47-generic 3.16.7-ckt8
  Uname: Linux 3.16.0-34-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.4
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Apr 24 16:18:44 2015
  InstallationDate: Installed on 2014-08-01 (265 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to utopic on 2015-04-24 (0 days ago)

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https://bugs.launchpad.net/bugs/1448163

Title:
  Cannot upgrade from Ubuntu 14.10 to 15.04

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

Bug description:
  sudo do-release-upgrade
  Checking for a new Ubuntu release
  Get:1 Upgrade tool signature [198 B]
  Get:2 Upgrade tool [1 221 kB]

  ....

  Checking package manager
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  Building data structures... Done

  Calculating the changes

  Calculating the changes

  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

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

  Restoring original system state

  Aborting
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  Building data structures... Done

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: ubuntu-release-upgrader-core 1:14.10.10
  ProcVersionSignature: Ubuntu 3.16.0-34.47-generic 3.16.7-ckt8
  Uname: Linux 3.16.0-34-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.4
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Apr 24 16:18:44 2015
  InstallationDate: Installed on 2014-08-01 (265 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to utopic on 2015-04-24 (0 days ago)

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