Change line 45 from this:
case $(lsb_release -is) in Debian) wget http://build.openvpn.net/downloads/releases/debian/5/openvpn_2.2.0-debian0_i386.deb;; Ubuntu) wget http://build.openvpn.net/downloads/releases/ubuntu/10.04/openvpn_2.2.0-ubuntu0_i386.deb;; *) echo "Unkown distribution";; esac
To this:
case $(lsb_release -is) in Debian) wget http://build.openvpn.net/downloads/releases/debian/5/openvpn_2.2.1-debian0_amd64.deb;; Ubuntu) wget http://build.openvpn.net/downloads/releases/ubuntu/10.04/openvpn_2.2.1-ubuntu0_amd64.deb;; *) echo "Unknown distribution";; esac