GNU/Linux Zorin OS 16 Installing Qt4 – Step by step Guide
How to Install Qt4 on Zorin OS 16.x LTS GNU/Linux desktop – Step by step Tutorial.
And Qt4 for Zorin OS is not any more supported from the Canonical Apt Repositories.
Finally, this guide includes detailed instructions about to Add Qt4 PPA Repository for Zorin OS 16.

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