If you cannot upgrade Guest Additions on a VirtualBox VM and instead see a VERR_NOT_FOUND error, take these steps to fix the issue.

The latest Ubuntu release uses a desktop system that's not quite compatible with VirtualBox's built-in tools, but there's a command line fix, as explained by the Unixmen site.

Each Linux system will be slightly different, but the Tombuntu blog's instructions for installing VirtualBox Guest Additions in Ubuntu hold mostly true: head to where the ISO is mounted as a CD ...

Install VirtualBox Guest Additions So that SteamOS is actually usable as a virtualized OS (clipboard sharing, shared folders, better mouse pointer integration), you must now install VirtualBox's ...

Install VirtualBox Guest Additions So that SteamOS is actually usable as a virtualized OS (clipboard sharing, shared folders, better mouse pointer integration), you must now install VirtualBox's ...