====  Disable netplan on Ubuntu to switch back to network iterfaces /etc/network/interfaces ====

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Install the package for the interfaces. Configure your stuff at **/etc/network/interfaces**
<code bash>
apt install ifupdown
</code>

Start the networking service
<code bash>
ifdown --force enp0s3 lo && ifup -a
systemctl unmask networking
systemctl enable networking
systemctl restart networking
</code>

F*ck netplan and systemd networking in the butt
<code bash>
systemctl stop systemd-networkd.socket systemd-networkd networkd-dispatcher systemd-networkd-wait-online
systemctl disable systemd-networkd.socket systemd-networkd networkd-dispatcher systemd-networkd-wait-online
systemctl mask systemd-networkd.socket systemd-networkd networkd-dispatcher systemd-networkd-wait-online
apt-get --assume-yes purge nplan netplan.io
</code>

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Source: https://tweenpath.net/ubuntu-18-04-disable-netplan-switch-networking-etc-network-interfaces/