Error updating OS to Bullseye

[hartez]

I'm having the same problem; when I run sudo apt-get update I get the following:

Hit:1 http://archive.raspberrypi.org/debian buster InRelease
Get:2 http://raspbian.raspberrypi.org/raspbian buster InRelease [15.0 kB]
Reading package lists... Done
E: Repository 'http://raspbian.raspberrypi.org/raspbian buster InRelease' changed its 'Suite' value from 'stable' to 'ol
dstable'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for det
ails.

[jfb]

This is an OS level issue. The solution is here:

Can't update to FTL 5.9 Final: "Error: Unable to update package cache."

That's an issue with updating your OS rather than with Pi-hole: Your OS is informing you that the repository is now oldstable. Answering [y]es to that question or running sudo apt-get update --allow-releaseinfo-change should allow your OS to reflect that change and continue.