Ubuntu – How to enter password on console with NetworkManager’s nmcli

Try connecting to VPN from command line. This will make sure that the problem is with NetworkManager and not something else. You can connect from command line using:

openvpn --config /path/to/config.ovpn

You may need to run this command using sudo.

If you can successfully connect from command line then try adding yourself to netdev group and uncheck Available to all users in vpn settings window in NetworkManager and then try connecting using NM.

I don't know how this work with NM but I write script

#!/bin/bash
function routeadd {
    route add -host xxx.xxx.xxx.xxx dev ppp0
    route add -net xxx.xxx.xxx.xxx/xx dev ppp0
}
function makepptp {
   echo pty \"pptp xxx.xxx.xxx.xxx --nolaunchpppd\" >> /etc/ppp/peers/vpn;
   echo remotename PPTP >> /etc/ppp/peers/vpn;
   echo require-mppe-128 >> /etc/ppp/peers/vpn;
   echo file /etc/ppp/options.pptp >> /etc/ppp/peers/vpn;
   echo ipparam vpn >> /etc/ppp/peers/vpn;
pppd call vpn &
}
if [ -a /etc/ppp/chap-secrets ];
        then
        rm /etc/ppp/chap-secrets
    echo $1 PPTP $2 '*' >> /etc/ppp/chap-secrets;
else
    echo $1 PPTP $2 '*' >> /etc/ppp/chap-secrets;
fi

if [ -e /etc/ppp/peers/vpn ];
    then
    rm /etc/ppp/peers/vpn;
    echo name $1 >> /etc/ppp/peers/vpn;
    makepptp;
    sleep 8;
    routeadd;
else
    echo name $1 >> /etc/ppp/peers/vpn;
    makepptp;
    sleep 8;
    routeadd;
fi

Usage:

sudo /path_to_script/vpn username password

note: set execute permision to script

Traffic is routed via vpn only if you add route, anything else go default gw.