Thanks for your efforts, Fred, but unfortunately, this does not work for Ubuntu 16.04 or Mint 18.2, because the two lines you found does not exist there. The NetworkManger.conf looks exactly the same as on Debian. Hopefully, the error won't exist anymore on the next Ubuntu and Mint version, respectively! ;-)
Thanks for your efforts, Fred, but unfortunately, this does not work for Ubuntu 16.04 or Mint 18.2, because the two lines you found does not exist there. The NetworkManger.conf looks exactly the same as on Debian. Hopefully, the error won't exist anymore on the next Ubuntu and Mint version, respectively! ;-)
Cheers
Uwe