There's no need for Guest Additions to copy text between host and guest machines in VirtualBox. To enable copying and pasting, power off the virtual machine, then go to Settings > General > Advanced.
Virtualbox is a great app for using different operating systems on your PC, so here's how to get a fresh virtual machine set up and running.
If the “Auto-resize Guest Display” is greyed out for you, go ahead and reboot your virtual machine and check if the issue is resolved. In case that doesn’t work, go ahead and restart your VirtualBox.
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