[Bug 1509490] Re: 15.04 won't upgrade to 15.10

[Christopher Barrington-Leigh]

*** This bug is a duplicate of bug 996916 ***
    https://bugs.launchpad.net/bugs/996916

I'm not convinced this should have been marked a duplicate of bug
#996916.   In anycase, uninstalling postGIS and postgresql may be a
workaround. If so, surely it's a fixable bug...

Commenting out lines in blacklist.cfg did not help. I restored them.

I tried

sudo apt-get remove postgresql

and that did not help. I reversed it.

I tried

sudo apt-get remove postgresql pgadmin3 postgresql-9.4-postgis-2.1

and that let me upgrade.

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https://bugs.launchpad.net/bugs/1509490

Title:
  15.04 won't upgrade to 15.10

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

Bug description:
  I get the following whenever I try to upgrade with "do-release-
  updgrade",

  
  [... much else ...]

  
  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 15.04
  Package: ubuntu-release-upgrader-core 1:15.04.14.2
  ProcVersionSignature: Ubuntu 3.19.0-31.36-generic 3.19.8-ckt7
  Uname: Linux 3.19.0-31-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  CrashDB: ubuntu
  Date: Fri Oct 23 15:23:22 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-07-15 (465 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to vivid on 2015-10-23 (0 days ago)

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