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