GNU/Linux Mint 20 Installing Qt4 – Quick-Start Guide
You Are Welcome! The Tutorial Shows You Step-by-Step How-to Install Qt4 in GNU/Linux Mint 20.x Ulyana/Ulyssa LTS Desktop.
And Qt4 for Mint 20 is not any more supported from the Canonical Apt Repositories.
Finally, this guide includes detailed instructions about to Add Qt4 PPA Repository for Linux Mint 20.

1. Accessing Shell
Open a Terminal window
(Press “Enter” to Execute Commands)
Contents
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