I don't know why, but the errormessage I entered in the e-mail vanished two times. So here (for the third time) directly entered at webportal here: $ jupyter-qtconsole Traceback (most recent call last): File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 578, in _build_master ws.require(__requires__) File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 895, in require needed = self.resolve(parse_requirements(requirements)) File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 786, in resolve raise VersionConflict(dist, req).with_context(dependent_req) pkg_resources.ContextualVersionConflict: (pyzmq 17.0.0 (/usr/lib64/python3.6/site-packages), Requirement.parse('pyzmq>=17.1'), {'qtconsole'}) During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/usr/bin/jupyter-qtconsole", line 6, in <module> from pkg_resources import load_entry_point File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3123, in <module> @_call_aside File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3107, in _call_aside f(*args, **kwargs) File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3136, in _initialize_master_working_set working_set = WorkingSet._build_master() File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 580, in _build_master return cls._build_from_requirements(__requires__) File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 593, in _build_from_requirements dists = ws.resolve(reqs, Environment()) File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 781, in resolve raise DistributionNotFound(req, requirers) pkg_resources.DistributionNotFound: The 'pyzmq>=17.1' distribution was not found and is required by qtconsole $