Hello Alejandro,

what happens, if you enter the command
notebook(open_viewer=True)
at the sage console?
Also try: properties of the Icon, Application tab, Advanced options,
"Do not close when command exits". Watch for error messages.

I have a certain suspicion, that sage tries to open a viewer, that
does not exist.

You can set the viewer with the environment variable SAGE_BROWSER,
for example (one single line at the unix console):
SAGE_BROWSER=firefox sage -c "notebook(open_viewer=True)"
which execute the command after the -c option.
Try a full path instead of firefox, if there are problems.
Also try:
sage -c "notebook()"
Another possibility is:
sage -notebook

If one of these works (the last two are equivalent to
1. starting sage
2. executing notebook()
and this seems to work for you),
use one of the two lines in your
SAGE-notebook.desktop file, for example:
Exec=/usr/local/bin/sage -notebook

With best regards,
Lars
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