ppa:ondrej - external storage 1

ppa:ondrej/apache2

https://launchpad.net/~ondrej/+archive/ubuntu/apache2

Ubuntu 22.04

2.4.52 to 2.4.58

https://serverfault.com/questions/1151794/apache-upgrade-to-2-4-58-on-ubuntu-22-04

Ubuntu 16.04

BestManfred Hampl (m-hampl) said on 2021-10-07:
Ondrej Sury has already removed packages for End of Life releases (like xenial) from his PPAs, but there seems to be a copy of apache2 version 2.4.46-2+ubuntu16.04.1+deb.sury.org+3 in https://launchpad.net/~andykimpe/+archive/ubuntu/php
Maybe that helps for the moment, but you still should consider an upgrade to a supported release of Ubuntu in due course.
https://answers.launchpad.net/ubuntu/+source/apache2/+question/698989

ppa:ondrej/php

ppaとは、Personal Package Archives の略で、個人が作成したパッケージとそれを保管する場所の意味です。
ondrejは、オンドレイ（アンドレア？）さんです。
Ubuntu 20.04.2.0にapache2,php,postgresqlをインストール 2021