pihole -up wont work on anything after debian bullseye.

adding this info to bookworm+ makes it work again:

sudo echo VERSION_ID="11" >> /etc/os-release

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easy script to install Pi-Hole as a LXC-Container on Proxmox:

https://tteck.github.io/Proxmox/ (see "Ad Blocker - DNS Pi-hole LXC" )
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Pi-hole is a Linux network-level advertisement and Internet tracker blocking application which acts as a DNS sinkhole and optionally a DHCP server.

To create a new Proxmox Pi-hole LXC, run the command below in the Proxmox Shell.

bash -c "$(wget -qLO - https://github.com/tteck/Proxmox/raw/main/ct/pihole-v5.sh)"

⚡ Default Settings: 512MiB RAM - 2GB Storage - 1vCPU ⚡
⚠️ Reboot Pi-hole LXC after install

Pi-hole Interface: IP/admin

⚙️ To set your password:

pihole -a -p