[ubuntu] How to install package from Quantal into Precise

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http://ubuntuforums.org – Hello, Due to a specific bug in modem-manager that I'm stumbling upon I've been encouraged to update the version of MM that I'm running to the one at https://launchpad.net/ubuntu/quantal/amd64/modemmanager. I've tried downloading the .deb file but Software Centre then tells me that Modem-manager is already up to date. Can anybody help me to get this new version installed? Thanks (Hardware)