Comment 7 for bug 1594720

I ssh into the machine and tried to start a new container:

~$ sudo -E lxc launch ubuntu:16.04
Creating sauceless-jona
error: Get https://cloud-images.ubuntu.com/releases/streams/v1/index.json: Unable to connect to: cloud-images.ubuntu.com:443

~$ printenv | grep PROXY
NO_PROXY=10.52.18.2,127.0.0.1,192.168.2.1,192.168.2.2,::1,localhost
FTP_PROXY=http://10.52.18.78:3128
HTTPS_PROXY=http://10.52.18.78:3128
HTTP_PROXY=http://10.52.18.78:3128

I also set the proxy into the lxd config like John said and tried again

~$ sudo -E lxc config set core.proxy_https 'http://10.52.18.78:3128'
~$ sudo -E lxc config set core.proxy_http 'http://10.52.18.78:3128'
~$ sudo -E lxc launch ubuntu:16.04
Creating soporiferous-lorene
Retrieving image: 100%
Starting soporiferous-lorene

~$ sudo -E lxc list
+---------------------+---------+------+------+------------+-----------+
| NAME | STATE | IPV4 | IPV6 | TYPE | SNAPSHOTS |
+---------------------+---------+------+------+------------+-----------+
| soporiferous-lorene | RUNNING | | | PERSISTENT | 0 |
+---------------------+---------+------+------+------------+-----------+