15.04 won't upgrade to 15.10

[Christopher Barrington-Leigh]

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)

[Christopher Barrington-Leigh (cpbl)]

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.

[Sean Hayes (sean-hayes)]

Uninstalling several Postgresql packages worked for me too, thanks!