Install VirtualBox 6.1.44 on Linux Mint 21
Prereqs
Download
Download "VirtualBox 6.1.44" and the "Extension Pack" from the official website.
Open Terminal
Right-click on an empty space in the "Nemo" file manager and select "Open in Terminal".
Install VirtualBox
Use "dpkg" if you want to install a specific package version from a .deb file without repository interference. It's worth noting that when you use "dpkg" to install a package, it does not automatically resolve dependencies!
Fix broken dependencies
This command will attempt to install any missing dependencies required by the package you installed via "dpkg".
Install Extension pack
Start VirtualBox
Select "Menu" and start typing "vir". Start "Oracle VM VirtualBox".
Ignore new version
Version 7 is available, but let's use the most stable version 6.1.44 for now.
Disable update check
Select "File -> Preferences -> Update". Disable "Check for Updates".