sudo apt-get update
For whatever reason the project has not made a release after 2015. The PPA does not contain packages for any Ubuntu versions after that. You need to find alternative ways of getting the binaries/source of this project.
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IIT Madras Linux Users' Group
http://groups.google.co.in/group/linuxusers_iitm
http://www.cse.iitm.ac.in/~osslab/wiki
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அகிலன் (Akilan R)