Home / ubuntu / Questions / 1404393
In Process
user823
Asked: 2022-04-25 20:32:33 +0800 CST

Unable to open Sagemath Jupyter in Firefox (after upgrade to 22.04)

  • 772

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.

firefox

2 Answers

  1. In 22.04, Ubuntu ships Firefox as a snap. The snap version of Firefox has strict file permissions for the sake of security, but often it compromises the user friendliness. The solution is to replace the snap version of firefox with the apt version.

    Add the Firefox PPA maintained by Mozilla team

    sudo add-apt-repository ppa:mozillateam/ppa

    Copy and paste the following code in a terminal (don't copy-paste line by line) to prioritize the apt version of firefox with the snap version.

    echo '
Package: *
Pin: release o=LP-PPA-mozillateam
Pin-Priority: 1001
' | sudo tee /etc/apt/preferences.d/mozilla-firefox

    Remove the snap version of firefox

    sudo snap remove firefox

    Install Firefox with apt.

    sudo apt install firefox

    This version of Firefox should update when you update the system with the update manager (but it does not automatically upgrade in the background like the snap version).

    Source: OMG Ubuntu

    • 6

  2. Instead of messing with Firefox, you can access SageMath through http://localhost:8888 instead.

    • 0