python-pkg-resources returns error code

[tornow]

The system is Debian Squeeze/Sid with apt.conf set to Squeeze as the default. Most packages are from Squeeze.
I ran apt-get upgrade and it returned an error-code. It might be it is this bug:
Bug#574153: python-pkg-resources: Missing file leaves it unconfigured
(i am not able to send links yet, sorry).
I tried aptitude install -f, to hold it and to remove the package python-pkg-resources, but i am getting told the package would be in a very bad stage, and i should re-install it.
That doesn't work.
Someone has got an idea?

[tornow]

I got it solved. Finally downloading and installing the *.deb-package did it.