Uninstall Netplan

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These directions have been tested also to Ubuntu 18.04.1 and will very likely work also for any future release using netplan and systemd.

There's no need at all to fiddle with GRUB nor any manual file removal. The configuration set up in /etc/networking files and directories will survive reboots.

These are the verified steps:

1. Check the actual interface names you are interested in with ip l for the links (aka interfaces) and with ip a for addresses.
2. Install ifupdown with sudo apt -y install ifupdown.
3. Purge netplan with sudo apt -y purge netplan.io.
4. Configure /etc/network/interfaces and/or /etc/network/interfaces.d accordingly to your needs (man 5 interfaces can be of some help with examples).
5. Restart the networking service with sudo systemctl restart networking; systemctl status networking or sudo /etc/init.d/networking restart; /etc/init.d/networking status. The output of the status command should mention active as its status.
6. The command ip a will show whether the expected network configuration has been applied.
7. Optionally, manually purge the remants of the netplan configuration files with sudo rm -vfr /usr/share/netplan /etc/netplan.

No reboot is needed in order to "refresh" the IP configuration: it will be active as of step no.5 . In case of troubles, double-check the interface names. A typical IPv4 DHCP configuration will resemble this one:

auto enp0s3
iface enp0s3 inet dhcp

while a static IPv4 address can be configured like this:

auto enp0s3
iface enp0s3 inet static
address 192.168.255.42/24
gateway 192.168.255.254
#dns-nameservers 8.8.8.8 208.67.222.222

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