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The problem seems to be that Ubuntu's default Firefox is now installed with a snap package rather than via a .deb from a repository and snap installed applications do not have access to dotted files and redirect file is in ~/.local/. One solution suggested on Stackexchange Ask Ubuntu is to place the line

c.NotebookApp.use_redirect_file = False

in the jupyter configuration file $SAGE_ROOT/local/etc/jupyter/jupyter_notebook_config.py. This solution worked for me.