I guess your computer is left vulnerable.
So you should use
```
sudo spctl --master-enable
```
We are fixing slow start-up of Sagemath and also problems of permissions.
SageMath-8.9 is OK for MacOS upto MacOS Mojave.
SageMath-9.0 needs techniques for installation on MacOS Mojave.
Many people complains problems of SageMath-9.0 on MacOS Catalina.
I only understood two or three symptoms reported but I located one
essential problem.
So, we are in a rather transient situation.
For the user's of sagenb notebook, I'd rather recommend to use SageMath-8.9
while
waiting for SageMath get OK with Catalina. I think you are in this category.
For MacOS freak, I recommend to try the following procedure in the same
account:
(This works for MacOS Mojave. On the other hand, no one reported it to work
on Catalina.)
(1) Copy SageMath-9.0 from disk-image to /Applications. Do not double click
it at this moment.
(2) Open /Applications/Utilities/Terminal.app
(3) In the terminal window, issue the following command
```
myhome$ /Applications/SageMath-9.0.app/sage
```
(4) Quit sage after the sage-prompt asks you for input something.
(5) Diable verification by "sudo spctl --master-disable".
(6) Double click /Applications/SageMath-9.0.app
(7) Specify your folder for Sagemath when a dialogue asks it.
This folder is something close to the folder tree ~/.sage of
notebooks.
But it must be different from ~/.sage.
Sagemath does not start-up on Catalina if this folder is not specified
at the dialogue.
(8) If Sagemath opened a web-page of jupyter notebook
and you verify this page accept programs of Sagemath (e.g.
print("hello") ),
then quit Sagemath by the menu.
(9) Use " sudo spctl --master-enable" to restart protection.
I guess this explanation gives an impression of a gap between (7) and (8).
This is because we are still fighting the problem behind (7).
If you are in this category, I welcome claims from you.
Alternatively, if you want to go to new versions of Sagemath,
please wait for Sagemath-9.1.
2020年4月4日土曜日 13時25分46秒 UTC+9 Anita Rojas:
>
> Thanks. I did:
>
> sudo spctl --master-disable
>
> and it worked. I have a question: Did I leave my computer vulnerable by
> doing so?
>
> Second: I was used to use notebook() but it did not work.
>
> Deep thanks for your help
> Anita
>
> ...
>
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