cat /etc/issue

Ubuntu 12.04.4 LTS \n \l

cat /etc/lsb-release

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION=”Ubuntu 12.04.4 LTS”

nano /etc/apt/sources.list

#deb http://kambing.ui.ac.id/ubuntu/ lucid main restricted universe multiverse
#deb http://kambing.ui.ac.id/ubuntu/ lucid-updates main restricted universe multiverse
#deb http://kambing.ui.ac.id/ubuntu/ lucid-security main restricted universe multiverse

deb http://repo.ugm.ac.id/ubuntu precise main restricted multiverse universe
deb http://repo.ugm.ac.id/ubuntu precise-updates main restricted multiverse universe
deb http://repo.ugm.ac.id/ubuntu precise-security main restricted multiverse universe