Setelah googling akhirnya ketemu solusi
Ternyata perlu dilakukan editing file /etc/dbus-1/system.d/nm-openvpn-service.conf
Tambahkan baris berikut diantara dua aturan policy yang ada
user="at_console">
own="org.freedesktop.NetworkManager.vpnc"/>
send_destination="org.freedesktop.NetworkManager.vpnc"/>
>
"-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">>
user="root">
own="org.freedesktop.NetworkManager.openvpn"/>
send_destination="org.freedesktop.NetworkManager.openvpn"/>
>
user="at_console">
own="org.freedesktop.NetworkManager.vpnc"/>
send_destination="org.freedesktop.NetworkManager.vpnc"/>
>
context="default">
own="org.freedesktop.NetworkManager.openvpn"/>
send_destination="org.freedesktop.NetworkManager.openvpn"/>
>
>
Sumber