The Guide shows you Step-by-Step How to Install and Quick Start with the Latest VirtualBox 7.4 by apt-get for Snow-Linux 4 Glacier i386/amd64 desktop.
Finally, the post’s Content is Expressly Reduced to Give Focus to the Essentials Instructions and Commands.

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Open Terminal Window
(Press “Enter” to Execute Commands)In case first see: Terminal QuickStart Guide.
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How to Add the Latest VirtualBox Repo for Debian-Wheezy Based:
Snow-Linux 4 Latest VirtualBox Repo