How to downgrade linux-image-generic-pae

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http://askubuntu.com – I'm trying successfully complete a apt-get -f install but it fails because it says it needs version of this package but is installed. I found another post that explains how to downgrade a package, but when I try to downgrade this pkg, I get a message saying the lower package doesn't exist. This is on 12.04 Server edition. (HowTos)