15.10, Getting some 404 errors when I apt-get update

Question

Specifically, it's for some PPAs and not the system in general. The URLs are, as far as I can tell, correct. I only use sudo apt-get update, and tried the sudo apt-get update && sudo apt-get upgrade solution suggested in one of the suggested threads. The specific error is:

Err http://ppa.launchpad.net wily/main i386 Packages
404 Not Found

Of course, this is just one of four. The complete set is at the bottom of this post. Like I said, the URL is alright as far as I know, as it follows the same format as other updates which didn't 404. So, any idea as to the solution for this?

The full list:

Err http://ppa.launchpad.net wily/main amd64 Packages
404 Not Found

Err http://ppa.launchpad.net wily/main i386 Packages
404 Not Found

W: Failed to fetch http://ppa.launchpad.net/caffeine-developers/ppa/ubuntu/dists/wily/main/binary-amd64/Packages 404 Not Found

W: Failed to fetch http://ppa.launchpad.net/caffeine-developers/ppa/ubuntu/dists/wily/main/binary-amd64/Packages 404 Not Found

Answer 1

The "Caffeine Developers" PPA does not have packages for Wily, as you can see because "Wily" does not appear in the "Published in" drop-down list. This is probably because version 2.8.3 of caffeine is in the official Wily repositories, rendering this PPA useless.