I installed python3-jsonschema on clean debian stretch amd64 lxc container and could reproduce the issue
installing python3-pkg-resources fixes it: # apt-get install python3-jsonschema ... # jsonschema Traceback (most recent call last): File "/usr/bin/jsonschema", line 5, in <module> from pkg_resources import load_entry_point # apt-get install python3-jsonschema python3-pkg-resources ... # jsonschema usage: jsonschema [-h] [-i INSTANCES] [-F ERROR_FORMAT] [-V VALIDATOR] schema JSON Schema Validation CLI positional arguments: schema the JSON Schema to validate with optional arguments: -h, --help show this help message and exit -i INSTANCES, --instance INSTANCES a path to a JSON instance to validate (may be specified multiple times) -F ERROR_FORMAT, --error-format ERROR_FORMAT the format to use for each error output message, specified in a form suitable for passing to str.format, which will be called with 'error' for each error -V VALIDATOR, --validator VALIDATOR the fully qualified object name of a validator to use, or, for validators that are registered with jsonschema, simply the name of the class.
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