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It looks like you've installed a different version of ROS from https://launchpad.net/~deb-rob/+archive/ubuntu/ros-trusty , and the packages from that repository are conflicting with the official ROS packages.
The obvious package that's conflicting is libsdformat, but given the size of that repository I suspect there are other conflicts too.
You'll need to remove the conflicting packages that you installed from that repository if you want to install the packages from the official repository; that will probably mean uninstalling the other version of ROS from that repository.