GNU/Linux Mint 20 Installing Qt4 – Step by step Guide
How to Install Qt4 in GNU/Linux Mint 20.x Ulyana/Ulyssa/Uma/Una LTS desktop – Step by step Tutorial.
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)
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