Ubuntu Network Troubleshoot

NetworkManager

• nm-applet to run old GUI and activate Enable Networking.

• nm-connection-editor to edit any weird configuration in the connections.

• You can also see what the NetworkManager is doing with these commands.

# Run one by one to see if anything is useful
nmcli device
nmcli
nmcli device show

unmanaged means NetworkManager will not manage that device.

Documentation: https://help.ubuntu.com/community/NetworkManager

Netplan

# Create a config file
sudo nano /etc/netplan/ethernet.yaml

and enter this

network:
  version: 2
  renderer: networkd
  ethernets:
    eno1:
      dhcp4: true

replace eno1 with whatever your device is (mine was ens33). To see your list of devices, run ip addr.

Finally apply the new configurations

sudo netplan apply

Documentation: https://netplan.io/reference#examples