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First, the server that serves DHCP will definitely need a static IP address. This means 
you'll need to configure Netplan with a static IP assignment. A static lease won't 
work here, since the DHCP server can't assign an IP address to itself. Also, the IP 
address that you designate for your server's static IP must be in the same network 
as the addresses that you plan to serve. Otherwise, the service will fail to start even 
after we configure it.
Once you assign a static IP address, the next step is to install the 
isc-dhcp-server
 
package:
sudo apt install isc-dhcp-server
Check the status of the daemon after installing the 
isc-dhcp-server
 package, using 
the following command:
systemctl status isc-dhcp-server 
You'll likely notice that it failed:
Figure 11.2: isc-dhcp-server failing by default
If it did fail to start, there's no need to be concerned. Ubuntu, by default, starts 
most of the services that are installed via packages. Sometimes, a service needs to 
be configured before it can run. In the case of the 
isc-dhcp-server
, it needs a valid 
configuration in order to start, but we have yet to configure anything. We need to 
configure the 
isc-dhcp-server
 service for it to be useful, so let's stop the service for 
now. 
If you have yet to set a static IP address, 
Chapter 10
, 
Connecting to 
Networks
, has a section that will walk you through the process.

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Setting Up Network Services