charm doesn't work in bionic with bionic landscape-client

[Andreas Hasenack]

I branched https://code.launchpad.net/~landscape/landscape-client-charm/trunk and hacked metadata.yaml to support bionic.

Then I deployed it like this:
juju deploy ./landscape-client-charm --config origin=ppa:landscape/trunk --series bionic

I already had a cs:bionic/ubuntu container deployed, so I related them together:

juju add-relation landscape-client ubuntu

That failed with this error:
unit-landscape-client-0: 18:21:17 ERROR juju.worker.uniter.operation hook "config-changed" failed: fork/exec /var/lib/juju/agents/unit-landscape-client-0/charm/hooks/config-changed: no such file or directory

config-changed is a symlink to hooks.py, which has a shebank line like this: "#!/usr/bin/python".

There is no /usr/bin/python in that bionic ubuntu container, just /usr/bin/python3.

Just to see how far it would get, I made a symlink /usr/bin/python -> python3. Then I get this import error:
unit-landscape-client-0: 18:25:16 DEBUG unit.landscape-client/0.config-changed Traceback (most recent call last):
unit-landscape-client-0: 18:25:16 DEBUG unit.landscape-client/0.config-changed File "/var/lib/juju/agents/unit-landscape-client-0/charm/hooks/config-changed", line 16, in <module>
unit-landscape-client-0: 18:25:16 DEBUG unit.landscape-client/0.config-changed from common import (
unit-landscape-client-0: 18:25:16 DEBUG unit.landscape-client/0.config-changed File "/var/lib/juju/agents/unit-landscape-client-0/charm/hooks/common.py", line 11, in <module>
unit-landscape-client-0: 18:25:16 DEBUG unit.landscape-client/0.config-changed from landscape.configuration import (
unit-landscape-client-0: 18:25:16 DEBUG unit.landscape-client/0.config-changed ModuleNotFoundError: No module named 'landscape.configuration'

[Andreas Hasenack (ahasenack)]

If I install python-minimal, which provides /usr/bin/python (python2.7), it also fails with the same import error.