Debian (12) based instructions with manual unbound compilation
apt install build-essential libssl-dev libexpat-dev libevent-dev libcurl4-openssl-dev pkg-config libexpat1-dev libhiredis-dev golang flex bison
cd /root
git clone https://github.com/NLnetLabs/unbound.git
cd unbound
git checkout branch-1.19.0
./configure --with-libevent --with-libhiredis --enable-tfo-client
make
make install
cd /usr/local/etc/unbound/
ldconfig
unbound-anchor
wget https://www.internic.net/domain/named.cache
useradd unbound
usermod -s /sbin/nologin unbound