sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse"
sudo add-apt-repository deb http://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse
sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse"
sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiverse"
sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse"
# Then install
sudo apt-get install aptitude