Ubuntu 22.04 / Tuxedo OS 3 Ethernet not working

Check if Ethernet-Adapters are disabled

lshw -class network

Allow “unmanaged” interfaces

sudo nano /etc/NetworkManager/conf.d/allow-unmanaged.conf

#add the following content
[keyfile]
unmanaged-devices=*,except:type:wifi,except:type:gsm,except:type:cdma,except:type:ethernet

Restart NetworkManager

sudo systemctl restart NetworkManager