I guess it is about the page of title "Home".
We do not have access to sagenb notebooks.
Instead we have access to jupyter notebooks.
For the current situation, you do not have any noebooks.
That is why no notebook is listed in the page.
You can try "New" button at the upper right corner below the grey
horizontal line.
If you play with some little program in the new notebook,
it might be a good chance to test upgrading sagenb notebooks.
This "upgrade" is only possible from command line.
The two relevant "sage --notebook=export --list" and "sage
--notebook=export ----ipynb TARGETFILENAME admin:NN". The former prints a
list of sagenb notebooks.
An example is here.
```
Unique ID | Notebook Name
-------------------------------------------------------------------------------
admin:0 | Save 30% by Sagemath (~/Manuals/SageTutorial9.0.pdf)
admin:1 | "Rabbit's population" $F_n$ is like $((1+\sqrt{5})/2)^n$!
admin:2 | Integral #1: $f(x)=\frac{1}{\sqrt{1-x^2}}$, $|x| < 1$.
admin:3 | Integral #2: why is f(x) = x * sqrt(1-x^2), (x in [-1,1])
easier?
admin:4 | Oval body & `tail' of @rana-aerea
admin:5 | Calculus of log|x|, x > 0.
admin:6 | mycalc
admin:7 | mycalc
```
The other command upgrades the notebook.
For example,
"sage --notebook=export ----ipynb mycalc-a admin:6"
converts the notebook with title "mycalc" with the unique id "admin:6".
It is possible some notebooks of yours have unique id of the form "guest:0"
or some other "user name". I guess
"sage --notebook=export ----ipynb guestnotebook guest:0"
also works.
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