make sure that for every deb entry in /etc/apt/sources.list you have a matching deb-src entry. The rest of the line must be identical.
something like deb-src http://in.archive.ubuntu.com/ubuntu xenial main. enable deb-src in /etc/apt/sources.list [removing the comments will help to enable it]
make sure that for every deb entry in /etc/apt/ sources. list you have a matching deb-src entry. The rest of the line must be identical.
something like deb-src http:// in.archive. ubuntu. com/ubuntu xenial main. enable deb-src in /etc/apt/ sources. list [removing the comments will help to enable it]