Right In The Pi-hole

Ran into issues with ubuntu-26.04-standard container in ProxMox in regards to dig: there was no output. Tested 22.04 and it worked. Resorted 25.04.

Pi-hole

Ubuntu 25.04 to 26.04

Takes about 10 minutes

sudo apt update && sudo apt install -y gnupg
sudo do-release-upgrade
sudo apt autoremove --purge
sudo apt clean
dpkg -l | grep '^rc' | awk '{print $2}' | xargs -r sudo dpkg --purge

Setup

sudo apt update && sudo apt upgrade -y
sudo apt install curl -y
sudo systemctl stop systemd-resolved
sudo systemctl disable systemd-resolved
sudo rm /etc/resolv.conf
echo "nameserver 1.1.1.1" | sudo tee /etc/resolv.conf
curl -sSL https://install.pi-hole.net | sudo PIHOLE_SKIP_OS_CHECK=true bash

Selections

Do the setup questions...

Password

pihole setpassword

URL

Go to http://IP:80/admin and login

Unbound

jnTracks pointed me this way...

Setup

sudo apt update
sudo apt install unbound -y
sudo nano /etc/unbound/unbound.conf.d/pi-hole.conf

Get Root Hints

curl -o /var/lib/unbound/root.hints https://www.internic.net/domain/named.root

PreFlight Check

sudo systemctl restart unbound
sudo systemctl enable unbound

Test both a pass and a servfail

dig pi-hole.net @127.0.0.1 -p 5335

dig sigfail.attrib.org @127.0.0.1 -p 5335

Point Pi-Hole to Unbound

1. Open your Pi-hole Admin Web Interface in a browser.
2. Navigate to Settings > DNS.
3. Uncheck any public Upstream DNS Servers you had enabled (e.g., Google, Cloudflare).
4. Under the Custom DNS (IPv4) fields on the right, check the box and input:
   • 127.0.0.1#5335
5. Click Save at the bottom of the page.