Good morning
I think it's a problem with your ssh id_rsa, as the error message shows. I suppose that when updating the OS version, you have lost the file ~/.ssh/id_rsa
Could you check if you have that file in the user's path?
In case you do not have it, you could generate a new one:
ssh-keygen -p
Subsequently, an id_rsa file will have been created, whose contents you should set in GitHub Desktop. I do not know the Git Hub desktop menu very well, since I have only worked with gerrit, but I am sure that there is some option in your user's configuration where you can add keys and copy the contents of that file id_rsa.
Once you have done that, if you try to work with your git repository, it should work and you should not see that error message again.
Greetings