For those who want to access virtual private network based on PPTP protocol through Ubuntu Edgy Eft, you might find the most helpful network setting tool in NetworkManager.

I suppose you have already installed NetworkManager so you just need to install the PPTP addon.

sudo apt-get install network-manager-pptp

After that, you may simply reboot or follows below steps.

killall NetworkManager
sudo NetworkManager
killall nm-applet
nm-applet &

For more information, read forum or howto.

Tags: vpn, networkmanager, pptp