LXC substrate failing on all tests

[Marco Ceppi]

EXIT_CODE: 0
Warning: Permanently added '10.0.3.96' (ECDSA) to the list of known hosts.
+ cd /home/ubuntu/charms/memcached
+ juju destroy-environment -y -e charm-testing-lxc
ERROR environment is not bootstrapped
+ '[' -n False ']'
+ failfast=--set-e
+ charm test -v -e charm-testing-lxc --set-e --timeout=45m
juju-test INFO : Starting test run on charm-testing-lxc using Juju 1.16.6
juju-test DEBUG : Loading configuration options from testplan YAML
juju-test DEBUG : Creating a new Conductor
juju-test.conductor DEBUG : Starting a bootstrap for charm-testing-lxc, kill after 300
juju-test.conductor DEBUG : Running the following: juju bootstrap -e charm-testing-lxc
ERROR error parsing environment "charm-testing-lxc": no public ssh keys found
juju-test.conductor WARNING : Could not bootstrap charm-testing-lxc, got Bootstrap returned with an exit > 0. Skipping
juju-test.conductor DEBUG : Starting a bootstrap for charm-testing-lxc, kill after 300
juju-test.conductor DEBUG : Running the following: juju bootstrap -e charm-testing-lxc
ERROR error parsing environment "charm-testing-lxc": no public ssh keys found
juju-test.conductor WARNING : Could not bootstrap charm-testing-lxc, got Bootstrap returned with an exit > 0. Skipping
juju-test INFO : Results: 0 passed, 0 failed, 2 errored