Failed to connect to socket /var/run/dbus/system_bus_socket
Error: Can't find out if NetworkManager is running: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory.The following fixed the problem:
apt-get install dbus
(if you already have dbus installed: sudo service dbus start)
/etc/init.d/network-manager start
What caused the error?:
/etc/init.d/network restart