How To Install PHP7.1(PHP 7.2, PHP 7.3) On Ubuntu 20.04 LTS Focal Fossa

Video show you how to install PHP7.1, PHP 7.2 or PHP 7.3 on Ubuntu 20.04 LTS Focal Fossa step by step.

This video may should apply to Ubuntu 18.04 LTS (Bionic Beaver) and Ubuntu 16.04 LTS (Xenial Xerus).

Commands used in this video:
sudo apt update
sudo apt upgrade
sudo apt install ca-certificates apt-transport-https
sudo apt update
sudo apt install php7.1

[contosecontos]

just to complement, you need to put this command $ sudo apt install php(version)-cli

[contosecontos]

I did every thing you said, but it continues showing the result: Unable to locate package php7.3

[brzenczykmenczyk]

E: Some index files failed to download. They have been ignored, or old ones used instead.

sudo apt install php7.1

E: Unable to locate package php7.3
E: Couldn't find any package by regex 'php7.3'