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Up until Ubuntu 11.04, Eigen3 is not part of the official Ubuntu repository, so the problem is most likely due to a conflicting version in another third-party repository. I suggest to force the ROS version for now.

For a long-term solution, it seems to me that ros-electric-eigen depending on a very specific version of libeigen3-dev is way too strict. If the package dependency were modified to e.g. Depends: libeigen3-dev (>= 3.0.1), the whole issue would resolve. This will become more urgent when Ubuntu 11.10 introduces its own version of libeigen3-dev (3.0.1-1).