Q:

error loading jupyter notebook permission denied: ipynb

I was working in a jupyter notebook until it froze.  It wouldn't save or shut down so I restarted my computer.  I launched jupyter notebook from an anaconda prompt, my folder directory opens per usual.  When i tried to open the notebook from before, I get an error loading screen that says permission denied: (name of notebook).ipynb.  I hit close and the notebook shuts down.  
I checked the folder permissions, I have full control.  I can create a new ipynb without any issues.  I can open other notebooks without any problem in the same folder.  I tried to run a trust notebook through the anaconda prompt and it says the notebook is missing. 
I need to recover this particular notebook as it has all my work.  Help!  Any ideas?  Thanks in advance. 
I work in the anaconda prompt in an environment other than the root, so this answer using sudo chmod doesn't work for me.  

A:

I had possibly the same problem.  In my case the problem was that jupyter notebook must have crashed or had some problem whilst autosaving. 
As a result, in the folder where the notebook is saved there's a temporary file called ".~nameofnotebook.ipynb". 
This file didn't show up in jupyter notebook, but only in the explorer.  I deleted the notebook file and renamed the temporary file to delete the ".~" prefix.  Make sure to save a copy of the notebook file before deleting anything in case your problem is different. 
The renamed temporary file opens fine and none of my data was lost.