Just a quick post on the syncing the Google Nexus 4 with Rhythmbox on Ubuntu 12.10 Quantal Quetzal.
I just got a new Google Nexus 4 but when I plugged it in to sync with Rhythmbox it was not recognized. A little research showed that it was libmtp that was out of date on Quantal (1.1.4 vs 1.1.5). Here is a quick-n-dirty how to on getting the updated library into /usr/local:
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Voila! Rhythmbox should now sync with your new Nexus 4!
If you need to connect to your Nexus 4 using anything other than rhythmbox just set LD_LIBRARY_PATH first and it should work as well.