When trying to update, I get the following error: [✗] Update local cache of available packages Error: Unable to update package cache. Please try "sudo apt-get update" Unable to complete update, please contact Pi-hole Support I tried sudo apt-get update and tried running pihole -up again, but…

Ok, to answer DanSchaper and to offer assistance to hartez, I did the following before pihole -up: sudo apt-get update --allow-releaseinfo-change It all worked after that.