GNU/Linux Mint 20 Install PHP 5.6 – Step by step Guide
How to Install PHP 5.6 on Mint 20.x Ulyana/Ulyssa/Uma/Una GNU/Linux desktop – Step by step Tutorial.
And to get the PHP 5.6 Mint 20 Setup you have to Manually Setup the Linux Mint 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
(Press “Enter” to Execute Commands).
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