This question already has an answer here:
When I tried to install software's (say Play on Linux / Eclipse), The software center says that
Available from multiverse source and there is only a button
Use this Source. At the same time I can remove softwares which I installed earlier.
I tried via
Terminal but it says that
Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package`
I tried this answer, But no visible change. the above result repeated and No install button on Software Center