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2013-04-17 08:12:31 -0500 received badge  Enlightened (source)
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2013-04-09 05:17:07 -0500 commented answer roscore crashing after automatic update

have you tried manual "sudo apt-get install ros-groovy-rosgraph" ?

2013-04-09 04:37:16 -0500 received badge  Editor (source)
2013-04-09 04:36:29 -0500 answered a question roscore crashing after automatic update

looks similar to this question: http://answers.ros.org/question/59644/rostopic-and-other-commands-fail-after-upgrade (rostopic and other commands fail after update)

2013-04-04 11:23:28 -0500 received badge  Teacher (source)
2013-04-04 01:39:15 -0500 answered a question Rosmake UWSim error - 1 package failed

had the same error. updating roslib solved it for me

sudo apt-get install ros-groovy-roslib
2013-04-04 01:19:53 -0500 received badge  Supporter (source)