薄荷上安装emacs24.4错误

我按照这个链接.但得到错误,如何解决？

$ sudo apt-get build-dep emacs24
[sudo] password for oracle: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to find a source package for emacs24

$ cat /etc/apt/sources.list
#deb cdrom:[Linux Mint 17 _Qiana_ - Release amd64 20140530]/ trusty contrib main non-free
  deb http://packages.linuxmint.com qiana main upstream import
           deb http://extra.linuxmint.com qiana main
           deb http://mirror.nexcess.net/ubuntu trusty main restricted universe multiverse
           deb http://mirror.nexcess.net/ubuntu trusty-updates main restricted universe multiverse
           deb http://security.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse
           deb http://archive.canonical.com/ubuntu/ trusty partner

sinelaw.. 11

打开软件源应用程序,然后单击"启用源代码存储库"

然后再试一次.

打开软件源应用程序,然后单击"启用源代码存储库"

然后再试一次.