Comment 223 for bug 868034

modemmanager 0.6~git201206221719.8289a64-0ubuntu1 is in Ubuntu 12.10 "Quantal Quetzal" development repositories if you want to burn a LiveCD and test with that.

According to https://launchpad.net/ubuntu/+source/modemmanager there doesn't seem to be any modemmanager PPA's for Oneiric.