Learn how to install VirtualBox Guest Additions on Ubuntu to enable seamless integration, screen resizing, clipboard sharing, ...

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.

Although VirtualBox installs more than one driver and packages with the actual installation, it doesn’t install the Guest Additions image. Without this package, you cannot use Seamless Mode in ...

For those that are using Oracle VirtualBox, which is free, some people forget to install the Guest Additions, which installs drivers to make navigating inside the VM much more pleasant.