Traceback (most recent call last):


 "/opt/eff.org/certbot/venv/bin/letsencrypt", line 7, in <module>

from certbot.main import main


 "/opt/eff.org/certbot/venv/local/lib/python2.7/site-packages/certbot/main.py", line 4, in <module>

import logging.handlers


 "/usr/lib/python2.7/logging/__init__.py", line 26, in <module>

import sys, os, time, cStringIO, traceback, warnings, weakref, collections


 "/usr/lib/python2.7/weakref.py", line 14, in <module>

from _weakref import (
ImportError: cannot import name _remove_dead_weakref

Traceback (most recent call last):


 "/home/ralf/.local/bin/mu-editor", line 7, in <module>

from mu.app import run


 "/home/ralf/.local/lib/python3.5/site-packages/mu/app.py", line 29, in <module>

from PyQt5.QtCore import QTimer, Qt
ImportError: /home/ralf/.local/lib/python3.5/site-packages/PyQt5/QtCore.so: undefined symbol: PySlice_AdjustIndices
