Hook install failed - Cannot uninstall 'PyYAML'

[licsuj27]

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Checklist

• Confirmed this is an issue with charm-tools, not charmstore-client
• Provide versions of tools used
• Described the feature or ways to replicate the issue

What version am I running?

I ran the following command: snap info charm and got the following ouput:

2.8.1

I am using: (Your operating system)
ubuntu 18:04

Issue/Feature

When deploying the vanilla example project, I am getting error - hook failed- ' install'

I expect/expected the following

Container installing apache applications

Tell us what you think should have happened, including commands, outputs, etc
I am still new to juju charms, hence not sure what is the issue.

What I got

juju debug-log
ERROR juju.worker.uniter.operation hook "install" (via explicit, bespoke hook script) failed: exit st atus 1

Give us what you got, commands run, output, etc. If this is a feature request, delete this section.

juju debug-hooks vanilla/0

Cannot uninstall 'PyYAML'. It is a distutils installed project and thus we cannot accurately determine which files belong to i t which would lead to only a partial uninstall.

[licsuj27]

Ok,

So I changed line 207 in ~/charms/builds/vanilla/lib/charms/layer/basic.py and amendned

if not cfg.get('use_venv', True) and pre_eoan:
reinstall_flag = '--ignore-installed'
check_call([pip, 'install', '-U', reinstall_flag, '--no-index',
'--no-cache-dir', '-f', 'wheelhouse'] + list(pkgs),
env=_get_subprocess_env())

to

if not cfg.get('use_venv', True) and pre_eoan:
reinstall_flag = '--ignore-installed'
check_call([pip, 'install', '-U', reinstall_flag, '--no-index',
'--no-cache-dir', '--ignore-installed', '-f', 'wheelhouse'] + list(pkgs),
env=_get_subprocess_env())

             Is this normal practice?