Ubuntu Dpkg fails, how to restore this file

Hello; Can someone please tell me how to rebuilt the dpkg folder; I can't install or update anything; It fails every single time I try to do an upgrade or a new install.
Is there like a backup copy of this folder where I could just overwrite everything and also delete everything I was trying to upgrade and start from fresh. I don't want to re-install Ubuntu because I have configure a fax server and I took me a while to configure it right.
Can anyone help me out with this problem?

thank you