Ask your maven where Maven Home is
$ mvn -V Apache Maven 3.0.5 (r01de14724cdef164cd33c7c8c2fe155faf9602da; 2013-02-19 14:51:28+0100) Maven home: /home/myuser/maven
and in Eclipse add the Maven Home to Maven settings.
But the best solution is to use the Maven distribution from http://maven.apache.org/ . Just unzip this and configure in Eclipse. Maven from the system distribution works fine with the application installed from the system and is not suitable for development.
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