How do I fix dependency problem where using a Ubuntu pre-release?

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http://askubuntu.com – I'm using Ubuntu+1. When trying to install new packages, either manually or with muon, I get these errors: jon@jon-desktop:~/Apps/mendeleydesktop-1.5-dev4-linux-x86_64/bin$ sudo apt-get install kupfer [sudo] password for jon: Reading package lists... Done Building dependency tree Reading state information... Done You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies: kupfer : Depends: python-keybinder but it is not going to be installed Recommends: python-wnck but it is not going to be installed linux-headers-generic : (HowTos)