VPN INSTALLATION FOR LINUX
There are three different VPN options available for Linux/GNU, BSD and UNIX systems
OpenVPN is the best choice for all desktop users of Linux or BSD. It is extremely fast, secure and reliable.
L2TP/IPSec is the recommended replacement for PPTP, but linux support is not so good as for PPTP.
PPTP has some security problems and should only be used as last option or where nothing else works with your device or setup.