Cannot upgrade from Ubuntu 13.10 Saucy to 14.04 Trusty

[Swâmi Petaramesh]

Hi,

Trying to upgrade from Ubuntu 13.10 Saucy to 14.04 Trusty in the GUI, I get the attached image.

Using "do-release upgrade" in a terminal, it ends in :

<<<
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
=== Command detached from window (Sun Apr 20 12:27:09 2014) ===
=== Command terminated with exit status 1 (Sun Apr 20 12:27:09 2014) ===
>>>

With no explanation or way to fix it whatsoever...

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: ubuntu-release-upgrader-core 1:0.205.5
ProcVersionSignature: Ubuntu 3.11.0-19.33-generic 3.11.10.5
Uname: Linux 3.11.0-19-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
CheckboxSubmission: 46fb4d85e0c1991660d481d0bb0eb4b1
CheckboxSystem: edda5d4f616ca792bf437989cb597002
CrashDB: ubuntu
Date: Sun Apr 20 12:28:04 2014
EcryptfsInUse: Yes
MarkForUpload: True
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to saucy on 2014-04-20 (0 days ago)

[Swâmi Petaramesh (swami-petaramesh)]

Okay, I could fix this by uninstalling "flightgear" - after having taken a look at the logs that ubuntu-bug-report had attached to this bug...