E: Couldn't Find Any Package by Glob 'Php-7.4'

Hit the following commands to install php at any version (replace php7.4 with your required version) in Linux OS:

sudo apt-get update
sudo apt -y install software-properties-common
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt -y install php7.4

Check PHP Version :

php -v

You may need some other packages to install. You can do so by following the commands :

sudo apt-get install -y php7.4-cli php7.4-json php7.4-common php7.4-mysql php7.4-zip php7.4-gd php7.4-mbstring php7.4-curl php7.4-xml php7.4-bcmath
sudo apt install php7.4-fpm

Start FPM and check status :

systemctl restart php7.4-fpm
systemctl status php7.4-fpm

The above-mentioned actions resolved the problem.

If Still You are Facing below Error (Then Try tricky solution) its not official but worked for me.

Error: Unable to locate package php7.4

Scenario: I was using Ubuntu 20 in azure after trying all documents and efforts but couldn't install PHP.

Solution: I just replaced /etc/apt/source.list file content with fresh Ubuntu 20 /etc/apt/source.list file content and then It worked :-)

Reference Docs :