Could you give some details on what type of installation you did and what desktop you are using? On an Ubuntu Desktop netplan.io should be installed and when the NetworkManager backend is in use then the unmanaged device list is emptied
the behaviour is explained in that changelog entry https://launchpad.net/ubuntu/+source/network-manager/1.2.2-0ubuntu8 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1885127 Title: ethernet interfaces explicity excluded from management in globally- managed-devices.conf Status in network-manager package in Ubuntu: Incomplete Bug description: The file `/usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf` included with this package (installed via apt in 19.10 environment) contains the line: ``` unmanaged-devices=*,except:type:wifi,except:type:gsm,except:type:cdma ``` In my system (laptop with no native ethernet), this results in the inability to easily use USB/ethernet adapters. After manually modifying: ``` unmanaged-devices=*,except:type:wifi,except:type:gsm,except:type:cdma,except:type:ethernet ``` the USB/ethernet adapter is detected and configured automatically by NetworkManager To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1885127/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
