How did you add the PPA to your sources.list? You can't use the shortcut (ppa:example), you'll have to use the following (4.5 is based on ubuntu "maverick"):

deb http://ppa.launchpad.net/example/ppa/ubuntu maverick main
deb-src http://ppa.launchpad.net/example/ppa/ubuntu maverick main

Alternatively you may be able to download the package and install manually (again, remember to get the build for "maverick")

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