[SOLVED] Update Unauthorized, after latest update.

I had this same issue and beat my head against a wall for the longest time. The answer is indeed in the Package_Repositories page, but its not as explicit as you'd like. I had to edit my repositories list at /etc/apt/sources.list as stated in the post, but you also have to comment out the line listed in /etc/apt/sources.list.d/pve-enterprise.list. If you don't comment out the line in the second file, it still tries to use the enterprise repo. After commenting that out, run apt update and it should work.
Also me, just registered just to say thank to @kirkofthefleet
 
After following all the steps and if you are still facing the same error, do the following
Code:
root@zeus:~# ls -l /etc/apt/sources.list.d/
total 4
-rw-r--r-- 1 root root 75 Oct 27 19:35 ceph.list
-rw-r--r-- 1 root root  0 Oct 27 19:32 pve-enterprise.list
If you see ceph.list. Edit that and comment that line too!! Now your apt-get update / upgrade should work
 

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