Cannot install incus on Ubuntu focal - not found

Having eventually got around to trying out incus and planning to migrate from LXC/LXD, I am disappointed to report that the basic installation instructions do not work for a fairly vanilla Ubuntu server (focal) machine:

tom@walnut:~$ sudo apt install incus
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package incus

version info:

Distributor ID: Ubuntu

Description: Ubuntu 20.04.6 LTS

Release: 20.04

Codename: focal

Note I have solved the problem but had to add the Zabbly repo to do so:

sudo mkdir -p /etc/apt/keyrings
$ sudo curl -fsSL https://pkgs.zabbly.com/key.asc -o /etc/apt/keyrings/zabbly.asc
$ sudo vi /etc/apt/sources.list.d/zabbly-incus-stable.sources

adding:

Enabled: yes
Types: deb
URIs: https://pkgs.zabbly.com/incus/stable
Suites: focal
Components: main
Signed-By: /etc/apt/keyrings/zabbly.asc

$ sudo apt update

$ sudo apt install incus
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It looks like you need at least Ubuntu 24.04 for a native package. Zabbly supports Ubuntu starting with 20.04.

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