Same problem for me: This fixed it for me. Thanks Jan Tarpila
ifupdown managed=false to true in /etc/NetworkManager/nm-system-settings.conf
service network-manager start
Dell E4300.
Same problem for me: This fixed it for me. Thanks Jan Tarpila
ifupdown managed=false to true in ager/nm- system- settings. conf
/etc/NetworkMan
service network-manager start
Dell E4300.