Under the Storage settings, remove the attached iso under Controller:IDE.Ģ.) Next add new optical drive, and click “Leave Empty” in the select dialog.Īfter saving the changes, start the Guest OS and try to install the additions again. And it will pop-up an error dialog:ĭon’t know why but do following steps will fix the issue in next Guest boot:ġ.) Power off the Guest OS, then go to its Settings page.
It happens in my case when trying to install the additions in Elementary OS 6. Sometimes it outputs an error “Unable to insert the virtual optical disk … into the machine …” when you click on the menu option in VM (VirtualBox Machine). Unable to insert the virtual optical disk:
