I've just tried to install dovescot and ellen had fixed the error yet it seems there are a couple because I get the following error message appears, see attachment.
Snap_2011.10.02 15.30.33_006.png
Snap_2011.10.02 15.30.09_005.png
I hope you can help me further because I can not do anything for the time.I do an apt-get dist-upgrade will see the following attachment