Howto setup NetworkManager on the 18.04 LTS (and newer) systems installed from mini.iso

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Starting point

For some reason we have installed the system from mini.iso. Then we have install MATE desktop into the system by one of the commands:

  • Minimal desktop

     sudo apt-get install ubuntu-mate-core^

  • Full desktop

    sudo apt-get install ubuntu-mate-desktop^

Then on first boot of installed MATE desktop we can see that NetworkManager is unable to manage the network interfaces and shows that at least Ehernet Network — device not managed.
This should be fixed. And below is the method to fix it.

Setup NetworkManager

With the help of this Q&A from AskUbuntu we need to do the following:

Remove systemd-networkd renderer:

sudo rm /etc/netplan/01-netcfg.yaml

Restore NetworkManager renderer:

cat <<EOF | sudo tee /etc/netplan/01-network-manager-all.yaml 
# Let NetworkManager manage all devices on this system
network:
  version: 2
  renderer: NetworkManager
EOF

Apply netplan configuration with:

sudo netplan apply

Restart NetworkManager

sudo service network-manager restart

Optionally restore contents of /etc/network/interfaces

cat <<EOF | sudo tee /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
EOF

And then reboot.
The resulting system will use NetworkManager as it intended to be when MATE was installed from official full ISO.

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