error : couldn't find any package by regex gstreamer0.10-gconf

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I am using a ubuntu 14.04 and ros indigo. I just recently installed the pocketsphinx package. When I try to run the sample robocup.launch file, I get an error saying gconfaudiosrc is no element. Hence when i try sudo apt-get install gstreamer0.10-gconf, I get the following error:

E: Unable to locate package gstreamer0.10-gconf

E: Couldn't find any package by regex 'gstreamer0.10-gconf'

Any sugesstions on what I could do?