Comment 2 for bug 1814911

When Trusty is installed, it comes with Trusty's version of python-urllib3, which does not recommend or depend on python-ipaddress.

Once charm is installed with cloud archive, it upgrades python-urllib3 to newer version. This version does recommend python-ipaddress, but upgrades do not install recommended packages. Therefore python-ipaddress is not installed.

Either package should make sure it depends on ipaddress or charms should install ipaddress as part of the process.