Requirement already satisfied: tox in /usr/lib/python3/dist-packages (3.7.0) $ PATH=/usr/lib/postgresql/11/bin:${PATH} tox -e py27 GLOB sdist-make: /builds/cubicweb/cubes/datacat/setup.py py27 create: /builds/cubicweb/cubes/datacat/.tox/py27 ERROR: Error creating virtualenv. Note that some special characters (e.g. ':' and unicode symbols) in paths are not supported by virtualenv. Error details: InvocationError('Failed to get version_info for python2.7: Traceback (most recent call last):\n File "<string>", line 1, in <module>\nImportError: No module named json\n', None) ___________________________________ summary ____________________________________ ERROR: py27: Error creating virtualenv. Note that some special characters (e.g. ':' and unicode symbols) in paths are not supported by virtualenv. Error details: InvocationError('Failed to get version_info for python2.7: Traceback (most recent call last):\n File "<string>", line 1, in <module>\nImportError: No module named json\n', None) Cleaning up file based variables ERROR: Job failed: command terminated with exit code 1