I could until very recently run anaconda-navigator from the command line in ubuntu. Suddenly I can’t anymore. Following some posts in overleaf and elsewhere, I inserted
source ~/anaconda3/bin/activate root in .bashrc. This did not improve anything. I then removed anaconda and reinstalled it again. I had to install, given error messages, libffi and PyQt5. I also set the path to anaconda in .bashrc. What I get now as error while trying to run from the command line by typing in anaconda-navigator, is the following:

Traceback (most recent call last): File "/home/myself/anaconda3/bin/anaconda-navigator", line 7, in <module> from anaconda_navigator.app.main import main File "/home/myself/anaconda3/lib/python3.9/site-packages/anaconda_navigator/app/main.py", line 19, in <module> from anaconda_navigator.app.start import start_app File "/home/myself/anaconda3/lib/python3.9/site-packages/anaconda_navigator/app/start.py", line 32, in <module> from anaconda_navigator.widgets.main_window import MainWindow File "/home/myself/anaconda3/lib/python3.9/site-packages/anaconda_navigator/widgets/main_window/__init__.py", line 59, in <module> from anaconda_navigator.widgets.web.survey import SurveyDialog File "/home/myself/anaconda3/lib/python3.9/site-packages/anaconda_navigator/widgets/web/survey.py", line 17, in <module> from qtpy.QtWebEngineWidgets import QWebEngineView, QWebEnginePage, QWebEngineSettings File "/home/myself/anaconda3/lib/python3.9/site-packages/qtpy/QtWebEngineWidgets.py", line 28, in <module> from PyQt5.QtWebEngineWidgets import ( ImportError: /lib/x86_64-linux-gnu/libp11-kit.so.0: undefined symbol: ffi_type_pointer, version LIBFFI_BASE_7.0

What should I do ? Is there some other way of launching anaconda-navigator ?Thanks for your help.