I am trying to open Sagemath through Jupyter. I am getting the following message in Firefox:
Access to the file was denied The file at /home/tw/.local/share/jupyter/runtime/nbserver-61611-open.html is not readable. It may have been removed, moved, or file permissions may be preventing access.
Recently, I migrated to Ubuntu 22.04 (from 20.04). Under Ubuntu 20.04, Juypter worked finely. Also the file permissions are fine and all set to "rw" for all users. I have read somewhere that Firefox does not open hidden files anymore. I tried to change advanced settings in Firefox, without success. I could not even find the relevant advanced setting option. I cannot open the above html-file from chrome either. Reinstalling Sagemath was also not helpful.