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The problem was caused by missing entries in ros/tools/rosdep/src/rosdep/debian.py and core.py (as noted in a previous answer). Note that the debian.py mapping in self.version_map for the Mint class appears to have changed from using version numbers to code names as of Ubuntu 11.10/Mint 12. See my patch at https://code.ros.org/trac/ros/ticket/3858 for details.

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