No information provided about why upgrade cannot complete

[hackel]

When I run Software Updater to upgrade from 14.04 to 14.10, I get an error message:

"Could not determine 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."

Okay, fair enough, I've installed several packages from PPAs that could potentially cause a conflict. My problem is, this error message gives no useful information to target the problem. The "Terminal" arrow in the Distribution Upgrade window is greyed out, so I cannot see the output to find out what packages might be conflicting. I finally found the file /var/log/dist-upgrade/apt.log by looking at the lsof output, something no regular desktop user should be expected to do, which lead me to the problem.

This error message needs to provide the user with some useful information to solve the problem, at the very *least* pointing them to the apt.log file.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.5
ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
Uname: Linux 3.13.0-37-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Sat Oct 25 12:53:37 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-08-03 (82 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2014-10-25 (0 days ago)
VarLogDistupgradeTermlog:

mtime.conffile..etc.update.manager.release.upgrades: 2014-08-03T23:18:10.888639

[Brian Murray (brian-murray)]

Reviewing the files from your upgrade attempt you seem to have enabled a PPA that provides Xorg packages. This will prevent the upgrade as that PPA contains different versions of packages essential to Ubuntu. The page, https://launchpad.net/~xorg-edgers/+archive/ppa, contains details on to how to revert to the official Xorg packages for the xorg-edgers PPA. Instructions for reverting to official Xorg packages should be similar for the PPA that you have enabled.