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We can also tell that this configuration file pertains to interface 
enp0s3
. Putting it 
all together, this file is telling us that interface 
enp0s3
 is configured to automatically 
obtain an IP address via DHCP. If we'd like to convert this configuration to a static IP 
address instead, we should first back up the file:
sudo cp /etc/netplan/00-installer-config.yaml /etc/netplan/00-
installer-config.yaml.bak
This way, if we make a mistake, we can easily restore the original file by renaming 
the backup file to the original name. This is a good practice to get into, regardless of 
the file we're editing. Being able to restore a previous configuration is a best practice 
for just about any change we might be making. The first change we need to make is 
to remove the following line:
      dhcp4: true
Essentially, to set 
up a static IP we will replace that line with the details specific to 
our configuration. Here's an example of the file, configured for a static IP address:
# This is the network config written by 'subiquity'
network:
  ethernets:
    enp0s3: