update manager closes immediately after opening

[Edward Jackson III]

This happened when I tried to use the upgrade button in update manager to upgrade to 12.04. The upgrade was not successful.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.152.25.9
ProcVersionSignature: Ubuntu 3.0.0-17.30-generic 3.0.22
Uname: Linux 3.0.0-17-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu7
Architecture: i386
Date: Thu May 3 18:06:03 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to precise on 2012-05-02 (1 days ago)
VarLogDistupgradeAptlog:
 Log time: 2012-05-02 17:35:18.651175
 Log time: 2012-05-02 17:36:11.038144