Public bug reported:

We updated from 0.7.9 to 17.1 on Ubuntu 16.04. After that, cloud-init
fails to start.

Update:
Start-Date: 2017-11-15  06:03:19
Commandline: /usr/bin/unattended-upgrade
Upgrade: cloud-init:amd64 (0.7.9-233-ge586fe35-0ubuntu1~16.04.2, 
17.1-27-geb292c18-0ubuntu1~16.04.1), ubuntu-standard:amd64 (1.361, 1.361.1), 
ubuntu-server:amd64 (1.361, 1.361.1), grub-legacy-ec2:amd64 
(0.7.9-233-ge586fe35-0ubuntu1~16.04.2, 17.1-27-geb292c18-0ubuntu1~16.04.1), 
ubuntu-minimal:amd64 (1.361, 1.361.1)
End-Date: 2017-11-15  06:03:23

Failure:
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]: 2017-11-17 13:53:12,947 - 
util.py[WARNING]: failed stage init
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]: failed run of stage init
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]: 
------------------------------------------------------------
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]: Traceback (most recent call 
last):
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]:   File 
"/usr/lib/python3/dist-packages/cloudinit/cmd/main.py", line 638, in 
status_wrapper
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]:     ret = functor(name, 
args)
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]:   File 
"/usr/lib/python3/dist-packages/cloudinit/cmd/main.py", line 357, in main_init
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]:     
init.apply_network_config(bring_up=bool(mode != sources.DSMODE_LOCAL))
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]:   File 
"/usr/lib/python3/dist-packages/cloudinit/stages.py", line 635, in 
apply_network_config
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]:     netcfg, src = 
self._find_networking_config()
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]:   File 
"/usr/lib/python3/dist-packages/cloudinit/stages.py", line 622, in 
_find_networking_config
Nov 17 13:53:12 ip-10-50-198-224 systemd[1]: cloud-init.service: Unit entered 
failed state.
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]:     if self.datasource and 
hasattr(self.datasource, 'network_config'):
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]:   File 
"/usr/lib/python3/dist-packages/cloudinit/sources/DataSourceEc2.py", line 307, 
in network_config
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]:     
net.get_interface_mac(self.fallback_nic): self.fallback_nic}
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]:   File 
"/usr/lib/python3/dist-packages/cloudinit/net/__init__.py", line 506, in 
get_interface_mac
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]:     if 
os.path.isdir(sys_dev_path(ifname, "bonding_slave")):
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]:   File 
"/usr/lib/python3/dist-packages/cloudinit/net/__init__.py", line 38, in 
sys_dev_path
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]:     return 
get_sys_class_path() + devname + "/" + path
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]: TypeError: Can't convert 
'NoneType' object to str implicitly
Nov 17 13:53:13 ip-10-50-198-224 cloud-init[11795]: 
------------------------------------------------------------
Nov 17 13:53:12 ip-10-50-198-224 systemd[1]: cloud-init.service: Failed with 
result 'exit-code'.


This is pretty serious. Is it normal to do a major version update on an LTS 
release?

** Affects: cloud-init (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1732917

Title:
  17.1 update breaks EC2 nodes

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