yum -y install epel-release
yum -y install openvpn

Installer ifconfig
yum install net-tools

sudo apt-get update        # Fetches the list of available updates
sudo apt-get upgrade       # Strictly upgrades the current packages
sudo apt-get dist-upgrade  # Installs updates (new ones)

Source:

http://askubuntu.com/questions/196768/how-to-install-updates-via-command-line

https://doc.ubuntu-fr.org/lamp