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.

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.

As Oracle continues to digest and dissect the virtualization acquisitions that it’s made, it’s clear that VirtualBox has now officially escaped the chopping block Oracle has continued to develop and ...