Public bug reported:

I am getting backtrace when executing netplan apply with default
configuration on oracle cloud:

root@vpsoc:~# cat /etc/netplan/50-cloud-init.yaml
# This file is generated from information provided by the datasource.  Changes
# to it will not persist across an instance reboot.  To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    ethernets:
        ens3:
            dhcp4: true
            match:
                macaddress: [redacted]
            set-name: ens3
    version: 2
root@vpsoc:~# ll /etc/netplan/
total 12
drwxr-xr-x   2 root root 4096 Jan 25 16:28 ./
drwxr-xr-x 109 root root 4096 Jan 23 06:41 ../
-rw-r--r--   1 root root  481 Jun  4  2020 50-cloud-init.yaml
root@vpsoc:~# netplan apply
Traceback (most recent call last):
  File "/usr/sbin/netplan", line 23, in <module>
    netplan.main()
  File "/usr/share/netplan/netplan/cli/core.py", line 50, in main
    self.run_command()
  File "/usr/share/netplan/netplan/cli/utils.py", line 257, in run_command
    self.func()
  File "/usr/share/netplan/netplan/cli/commands/apply.py", line 55, in run
    self.run_command()
  File "/usr/share/netplan/netplan/cli/utils.py", line 257, in run_command
    self.func()
  File "/usr/share/netplan/netplan/cli/commands/apply.py", line 187, in 
command_apply
    changes = NetplanApply.process_link_changes(devices, config_manager)
  File "/usr/share/netplan/netplan/cli/commands/apply.py", line 283, in 
process_link_changes
    current_iface_name = utils.find_matching_iface(interfaces, match)
  File "/usr/share/netplan/netplan/cli/utils.py", line 199, in 
find_matching_iface
    matches = list(filter(lambda iface: is_interface_matching_macaddress(iface, 
match.get('macaddress')), matches))
  File "/usr/share/netplan/netplan/cli/utils.py", line 199, in <lambda>
    matches = list(filter(lambda iface: is_interface_matching_macaddress(iface, 
match.get('macaddress')), matches))
  File "/usr/share/netplan/netplan/cli/utils.py", line 185, in 
is_interface_matching_macaddress
    macaddress = get_interface_macaddress(interface)
  File "/usr/share/netplan/netplan/cli/utils.py", line 169, in 
get_interface_macaddress
    link = netifaces.ifaddresses(interface)[netifaces.AF_LINK][0]
KeyError: 17

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: netplan.io 0.101-0ubuntu3~20.04.2
ProcVersionSignature: Ubuntu 5.4.0-1035.38-oracle 5.4.78
Uname: Linux 5.4.0-1035-oracle x86_64
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: skip
Date: Mon Jan 25 16:32:04 2021
ProcEnviron:
 SHELL=/bin/bash
 LANG=C.UTF-8
 TERM=screen.xterm-256color
 PATH=(custom, no user)
SourcePackage: netplan.io
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: netplan.io (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal uec-images

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https://bugs.launchpad.net/bugs/1913062

Title:
  netplan apply backtrace

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