Unable to find a source package for unity error.

[RefinedCode]

I am trying to get unity to compile from source, but when i run:

$ sudo apt-get build-dep unity

I get the following error:

E: Unable to find a source package for unity

There is virtually nothing on google I can find (one result when i typed the error into google). Does anyone know how i can fix this? I dont know which source to add to get unity dependencies. Any help is greatly appreciated!

[steeldriver]

Do you have the appropriate deb-src lines uncommented in your /etc/apt/sources.list file? have you run 'sudo apt-get update' since adding the deb-src lines?