I'm actually setting up my vagrant vm (trusty-64, Ubuntu distribution v14.04) and encountered an issue during the installation of all ppa:ondrej/php packages.
I tried the default way to install php...
$ sudo apt-get install software-properties-common
$ sudo add-apt-repository ppa:ondrej/php
$ sudo apt-get update
$ sudo apt-get install php7.3
But it still has this issue:
E: Unable to locate package php7.3
E: Couldn't find any package by regex 'php7.3'
It seems he's ignoring the added repository (it's not listed in apt-get update) but the command seems fine:
gpg: Total number processed: 1
gpg: imported: 1 (RSA: 1)
OK
Actually, i have no clue whats wrong. Maybe someone has an idea and can explain it? Thanks a lot.
UPDATE:
Distributor ID: Ubuntu
Description: Ubuntu 14.04.6 LTS
Release: 14.04
Codename: trusty
used ubuntu/trusty64 vagrant box
It's the most common vagrant box with few well predefined settings.
source.list
/etc/apt/sources.list.d/ondrej-php-trusty.list
/etc/apt/sources.list.d/ondrej-php-trusty.list.save
It's in the source list, but it is still ignored. E.g. apt-cache search php7 gives always no result instead of an list.
I also destroyed the box an setup a new one.. but still the same issue.
I looked at the repository and it seems like 14.04 is no longer supported. Even though trusty is listed in the dist packages, when I looked into the pools there is nothing for ubuntu 14.04.
Take a look here:
http://ppa.launchpad.net/ondrej/php/ubuntu/pool/main/p/php7.3/
That probably explains why the repository is not being included when you run
sudo apt-get update
I guess that server update can't wait any longer ;)