System dependencies have not been satisfied, apt python-mock, apt python-coverage

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Hello, I am new to ros. I am using rosbuild to compile gmapping package, https://github.com/ros-perception/sla... tells me many lines of "No Makefile in package...". Then I use rosdep check gmapping command , the terminal show me "System dependencies have not been satisfied apt python-mock apt python-covergae" What's more, my ros version is groovy, operation system is ubuntu 12.04. What should I do next?