Comment 5 for bug 1796917

The Ubuntu 18.04 minimal cloud image from 22-Nov-2018 20:29 (https://cloud-images.ubuntu.com/minimal/releases/bionic/release/ubuntu-18.04-minimal-cloudimg-amd64.img)
is still affected from this issue:

cloud-init[108]: Cloud-init v. 18.4-0ubuntu1~18.04.1 running 'init-local' at Mon, 03 Dec 2018 08:49:26 +0000. Up 18.64 seconds.
cloud-init[108]: 2018-12-03 08:49:27,381 - util.py[WARNING]: failed stage init-local
cloud-init[108]: failed run of stage init-local
cloud-init[108]: ------------------------------------------------------------
cloud-init[108]: Traceback (most recent call last):
cloud-init[108]: File "/usr/lib/python3/dist-packages/cloudinit/cmd/main.py", line 658, in status_wrapper
cloud-init[108]: ret = functor(name, args)
cloud-init[108]: File "/usr/lib/python3/dist-packages/cloudinit/cmd/main.py", line 362, in main_init
cloud-init[108]: init.apply_network_config(bring_up=bool(mode != sources.DSMODE_LOCAL))
cloud-init[108]: File "/usr/lib/python3/dist-packages/cloudinit/stages.py", line 648, in apply_network_config
cloud-init[108]: netcfg, src = self._find_networking_config()
cloud-init[108]: File "/usr/lib/python3/dist-packages/cloudinit/stages.py", line 635, in _find_networking_config
cloud-init[108]: if self.datasource and hasattr(self.datasource, 'network_config'):
cloud-init[108]: File "/usr/lib/python3/dist-packages/cloudinit/sources/DataSourceConfigDrive.py", line 155, in network_config
cloud-init[108]: self.network_json, known_macs=self.known_macs)
cloud-init[108]: File "/usr/lib/python3/dist-packages/cloudinit/sources/helpers/openstack.py", line 655, in convert_net_json
cloud-init[108]: known_macs = net.get_interfaces_by_mac()
cloud-init[108]: File "/usr/lib/python3/dist-packages/cloudinit/net/__init__.py", line 595, in get_interfaces_by_mac
cloud-init[108]: (name, ret[mac], mac))
cloud-init[108]: RuntimeError: duplicate mac found! both 'sit0' and 'tunl0' have mac '00:00:00:00'
cloud-init[108]: ------------------------------------------------------------
[[0;1;31mFAILED[0m] Failed to start Initial cloud-init job (pre-networking).