Can confirm this issue occurs on Ubuntu 12.10 when trying to Sync with my Galaxy Nexus (stock 4.1.2).
To reproduce: Start Rhythmbox -> Connect phone -> Right click on Media player in sidebar -> Select properties Terminal output: [~] rhythmbox Android device detected, assigning default bug flags (rhythmbox:12603): GLib-GObject-CRITICAL **: g_type_instance_get_private: assertion `instance != NULL && instance->g_class != NULL' failed [1] 12603 segmentation fault (core dumped) rhythmbox -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to rhythmbox in Ubuntu. https://bugs.launchpad.net/bugs/1017750 Title: Rhythmbox freezes on "Media Player" context menu > "Properties" with Samsung Galaxy S3 connected Status in “rhythmbox” package in Ubuntu: Confirmed Bug description: Steps to reproduce: 1) Open rhythmbox 2) Connect a Samsung Galaxy S3; it will appear as "Media Player" 3) Right-click "Media Player" 4) Select "Properties" Rhythmbox will freeze. Description: Ubuntu 12.04 LTS Release: 12.04 rhythmbox: Installed: 2.96-0ubuntu4 Candidate: 2.96-0ubuntu4 Version table: *** 2.96-0ubuntu4 0 500 http://mirror.cs.umn.edu/ubuntu/ precise/main amd64 Packages 100 /var/lib/dpkg/status To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rhythmbox/+bug/1017750/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp