I was just installed the latest build of Ubuntu Gnome 15.04 Alpha 2. I install it on my VirtualBox version 4.3.24 on a Windows 7 host. The installation went well but I got problem when installing guest additions on it. The following error appears on my Ubuntu Gnome 15.04
It says Unable to access “VBOXADDITIONS_xxx. No authorized to perform operation. When I tried to upgrade VirtualBox to version 4.3.26, another problem comes up. I cannot even log in to my Ubuntu Gnome 15.04 desktop.