update-manager failed during upgrading from 8.10 to 9.04

[Marco]

Binary package hint: update-manager

I tried to upgrade from 8.10 to 9.04 and got a problem with vim-runtime ( reported here https://bugs.launchpad.net/ubuntu/+source/vim/+bug/307695 ).
But after report of this bug, Ubuntu asked me to report a new one (this one). I don't know exactly what was wrong except vim-runtime so I cannot tell you anything concrete.

ProblemType: Package
Architecture: i386
DistroRelease: Ubuntu 9.04
ErrorMessage: ErrorMessage: SystemError in cache.commit(): E:Sub-process /usr/bin/dpkg returned an error code (1), E:Sub-process /usr/bin/dpkg returned an error code (1)

NonfreeKernelModules: fglrx
Package: update-manager 1:0.95.1
PackageArchitecture: all
SourcePackage: update-manager
Title: package update-manager 1:0.95.1 failed to install/upgrade: ErrorMessage: SystemError in cache.commit(): E:Sub-process /usr/bin/dpkg returned an error code (1), E:Sub-process /usr/bin/dpkg returned an error code (1)
Uname: Linux 2.6.27-10-generic i686