I'm on Ubuntu 20.04.2 LTS.

When I want to open Jupyter-Notebook in terminal, the telegram desktop app opens.

The Jupyter-Notebook is actually opened in background. So I can open the browser and use it.

Here is the output:

(geospatial) siavash@siavash-fra:~$ jupyter-notebook 

[I 16:59:52.522 NotebookApp] Serving notebooks from local directory: /home/siavash

[I 16:59:52.522 NotebookApp] The Jupyter Notebook is running at:

[I 16:59:52.522 NotebookApp] http://localhost:8888/?token=192817dbf13703bc25bbd1f348df5e9c1c7c9275d579aef3

[I 16:59:52.522 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).

[C 16:59:52.526 NotebookApp] 

    

    To access the notebook, open this file in a browser:

        file:///home/siavash/.local/share/jupyter/runtime/nbserver-5326-open.html

    Or copy and paste one of these URLs:

        http://localhost:8888/?token=192817dbf13703bc25bbd1f348df5e9c1c7c9275d579aef3



(telegram-desktop:5339): lib_base-WARNING **: 16:59:53.204: Unfortunately, GTK integration conflicts with qgtk2 platformtheme and style. Therefore, QT_QPA_PLATFORMTHEME and QT_STYLE_OVERRIDE will be unset.

lib_base-Message: 16:59:53.204: This can be ignored by setting DESKTOP_APP_I_KNOW_ABOUT_GTK_INCOMPATIBILITY environment variable to any value, however, if qgtk2 theme or style is used, this will lead to a crash.

lib_base-Message: 16:59:53.204: GTK integration can be disabled by setting DESKTOP_APP_DISABLE_GTK_INTEGRATION to any value. Keep in mind that this will lead to some features being unavailable.

Gtk-Message: 16:59:53.412: Failed to load module "canberra-gtk-module"

Gtk-Message: 16:59:53.413: Failed to load module "canberra-gtk-module"

[ALSOFT] (EE) Failed to set real-time priority for thread: Operation not permitted (1)

I also looked at this similar question, but it doesn't answer mine.