Install fails on trusty - No module named 'requests'

[Tom Haddon]

With cs:elasticsearch-39 install fails on trusty:

2020-02-21 08:53:00 DEBUG install Traceback (most recent call last):
2020-02-21 08:53:00 DEBUG install File "/var/lib/juju/agents/unit-elasticsearch-0/charm/hooks/install", line 9, in <module>
2020-02-21 08:53:00 DEBUG install import requests
2020-02-21 08:53:00 DEBUG install ImportError: No module named 'requests'
2020-02-21 08:53:00 ERROR juju.worker.uniter.operation runhook.go:132 hook "install" failed: exit status 1

[Joe Guo (guoqiao)]

I am able to reproduce this:

unit-es-1: 21:03:13 DEBUG unit.es/1.install Traceback (most recent call last):
unit-es-1: 21:03:13 DEBUG unit.es/1.install File "/var/lib/juju/agents/unit-es-1/charm/hooks/install", line 8, in <module>
unit-es-1: 21:03:13 DEBUG unit.es/1.install import requests
unit-es-1: 21:03:13 DEBUG unit.es/1.install ImportError: No module named 'requests'
unit-es-1: 21:03:14 ERROR juju.worker.uniter.operation hook "install" failed: exit status 1
unit-es-1: 21:03:54 DEBUG unit.es/1.install Traceback (most recent call last):
unit-es-1: 21:03:54 DEBUG unit.es/1.install File "/var/lib/juju/agents/unit-es-1/charm/hooks/install", line 8, in <module>
unit-es-1: 21:03:54 DEBUG unit.es/1.install import requests
unit-es-1: 21:03:54 DEBUG unit.es/1.install ImportError: No module named 'requests'
unit-es-1: 21:03:54 ERROR juju.worker.uniter.operation hook "install" failed: exit status 1
unit-es-1: 21:05:16 DEBUG unit.es/1.install Traceback (most recent call last):
unit-es-1: 21:05:16 DEBUG unit.es/1.install File "/var/lib/juju/agents/unit-es-1/charm/hooks/install", line 8, in <module>
unit-es-1: 21:05:16 DEBUG unit.es/1.install import requests
unit-es-1: 21:05:16 DEBUG unit.es/1.install ImportError: No module named 'requests'
unit-es-1: 21:05:16 ERROR juju.worker.uniter.operation hook "install" failed: exit status 1

[Joe Guo (guoqiao)]

After installed `requests`, charm deploy still fail with with apt_key:

Failed to validate the SSL certificate for artifacts.elastic.co:443. Use validate_certs=no or make sure your managed systems have a valid CA certificate installed. Paths checked for this platform: /etc/ssl/certs, /etc/pki/ca-trust/extracted/pem, /etc/pki/tls/certs, /usr/share/ca-certificates/cacert.org, /etc/ansible

It seems like this charm has never been deployed in trusty?