GNU/Linux Ubuntu 20.10 Installing PHP 5.6 – Step by step Guide
How to Install PHP 5.6 in Ubuntu 20.10 Groovy GNU/Linux – Step by step Tutorial.
And to get the PHP 5.6 Ubuntu Groovy Installation, you have to Manually Setup the Ubuntu Apt PPA Repository.
Finally, this PHP 5.6 PPA includes also All the most Useful Extensions for PHP usage.

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1. Launching Terminal
Open a Terminal window
Ctrl+Alt+t on desktop
(Press “Enter” to Execute Commands).
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