Comment 9 for bug 1807615

(from cloud-init-output.log)

2018-12-15 07:21:07,921 - stages.py[WARNING]: Failed to rename devices: Failed to apply network config names. Found bad network config version: None

AFAICT the container never actually got networked; somehow the agent binary was downloaded:

+ curl -sSfw agent binaries from %{url_effective} downloaded: HTTP %{http_code}; time %{time_total}s; size %{size_download} bytes; speed %{speed_download} bytes/s --connect-timeout 20 --noproxy * --insecure -o /var/lib/juju/tools/2.4.4-bionic-amd64/tools.tar.gz https://10.142.0.4:17070/model/6146af0e-a943-4b69-8564-6d056025c5a7/tools/2.4.4-bionic-amd64
agent binaries from https://10.142.0.4:17070/model/6146af0e-a943-4b69-8564-6d056025c5a7/tools/2.4.4-bionic-amd64 downloaded: HTTP 200; time 0.318633s; size 26120071 bytes; speed 82138588.000 bytes/s + echo Agent binaries downloaded successfully.
Agent binaries downloaded successfully.

but the machine does not appear to be networked at the end of the cloud-init processing:

+ ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1410
        inet 252.0.217.26 netmask 255.0.0.0 broadcast 252.255.255.255
        inet6 fe80::216:3eff:fea6:d719 prefixlen 64 scopeid 0x20<link>
        ether 00:16:3e:a6:d7:19 txqueuelen 1000 (Ethernet)
        RX packets 1439 bytes 26289010 (26.2 MB)
        RX errors 0 dropped 0 overruns 0 frame 0
        TX packets 776 bytes 54278 (54.2 KB)
        TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
        inet 127.0.0.1 netmask 255.0.0.0
        inet6 ::1 prefixlen 128 scopeid 0x10<host>
        loop txqueuelen 1000 (Local Loopback)
        RX packets 476 bytes 38184 (38.1 KB)
        RX errors 0 dropped 0 overruns 0 frame 0
        TX packets 476 bytes 38184 (38.1 KB)
        TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0