ubuntu 20 wired unmanaged

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ubuntu 20 wired unmanaged

try

step 1

sudo code /etc/NetworkManager/NetworkManager.conf 

step 2

# NetworkManager.conf 
[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=true

[keyfile]
unmanaged-devices=*,except:type:wifi,except:type:gsm,except:type:cdma,except:type:wwan,except:type:ethernet,except:type:vlan

[device]
wifi.scan-rand-mac-address=no

step 3

sudo systemctl restart network-manager

https://superuser.com/a/1632034

if not working, try

https://askubuntu.com/a/1265396