Hi there,

I'm using linux mint right now, and wanted to use a usb ethernet adapter rather than the default-build-in-ethernet-card, but seems cannot get it to work.

I know that somebody tried to ask similar questions before,but following the answers of those post, I cannot have the problem solved.

Aiming to disable the default interface and add the usb one,I've put lines below to /etc/network/interfaces already

iface eno1 inet manual

auto eth0 (or eth1,or exnXXXXXXXXXX--(mac address))
allow-hotplug eth0
iface eth0 inet dhcp

and restarted networkmanager by
 

sudo systemctl restart network-manager.service

but it's still not working,

is there anything wrong with the lines above?

is it somewhere else I need to config, but didn't do?

really like to know your advice and thank you very much.

(BTW, there is no hardware or driver problem)