deb http://ftp.daumkakao.com/ubuntu/ xenial main
deb http://kr.archive.ubuntu.com/ubuntu/ xenial main
deb http://ftp.daumkakao.com/ubuntu/ xenial universe
deb http://kr.archive.ubuntu.com/ubuntu/ xenial universe
deb http://ftp.daumkakao.com/ubuntu/ xenial multiverse
deb http://kr.archive.ubuntu.com/ubuntu/ xenial multiverse
deb http://ftp.daumkakao.com/ubuntu/ xenial restricted
deb http://kr.archive.ubuntu.com/ubuntu/ xenial restricted