Whatever updates occurred in the last day set all the devices to managed=false in /etc/NetworkManager/nm-system-settings.conf
Change that and "sudo killall nm-system-settings" and it'll start working again.
Whatever updates occurred in the last day set all the devices to managed=false in /etc/NetworkMan ager/nm- system- settings. conf
Change that and "sudo killall nm-system-settings" and it'll start working again.