I also came across this bug on 17.10. Creating an empty /etc/NetworkManager/conf.d/10-globally-managed-devices.conf file did not work. But when I copied the file from /usr/lib and changed the value "unmanaged-devices" to none, I was able to manage all my network devices again using NM.
I also came across this bug on 17.10. Creating an empty /etc/NetworkMan ager/conf. d/10-globally- managed- devices. conf file did not work. But when I copied the file from /usr/lib and changed the value "unmanaged-devices" to none, I was able to manage all my network devices again using NM.