Proposal :

[/usr/share/netplan/netplan/cli/commands/ip.py]
# Extract out of the generator our mapping in a dict.
logging.debug('command ip leases: running %s', argv)
- out = subprocess.check_output(argv, universal_newlines=True)
+ try:
+    out = subprocess.check_output(argv, universal_newlines=True)
+ except CalledProcessError as e:
+    sys.exit("Failed to execute. Please make sure the interface %s is managed 
by netplan and configured to DHCP" % (self.interface))
mapping = {}

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https://bugs.launchpad.net/bugs/1768823

Title:
  netplan ip leases <interface>

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