sudo vi /etc/apt/sources.list
deb http://old-releases.ubuntu.com/ubuntu/ precise main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ precise-updates main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ precise-security main restricted universe multiverse
deb http://mirror.unpad.ac.id/ubuntu precise main restricted universe multiverse
deb http://mirror.unpad.ac.id/ubuntu precise-updates main restricted universe multiverse
deb http://mirror.unpad.ac.id/ubuntu precise-backports main restricted universe multiverse
deb http://mirror.unpad.ac.id/ubuntu precise-security main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu precise-security main restricted universe multiverse