First of all: Deinstall everything already installed with name 'virtualbox'.
Start from begin... (I assume, you have Sabayon X with Kernel 3.5.0)
You need to install:
- Virtualbox Modules 4.1.20#3.5.0-sabayon~2
- Xf86 Video Virtualbox 4.1.20#3.5.0-sabayon~2
- Virtualbox Guest Additions 4.1.20#3.5.0-sabayon~2
With that, you should have installed VirtualBox (that is the program name, you can start as user in cli)
But you need to do some more things before start it:
VirtualBox needs modules, started with:
And your username must be added to (the new group) vboxusers:
sudo adduser <benutzername> vboxusers
Then you should be able to start VirtualBox...
If you alread know VirtualBox, then you know, that you need to install the guest additions in your virtual machine then.
And .. if installed proper, you will find 'Oracle Virtual Box' in the start menu under systems sub menu.
Hope, I could help you...
-Linuxfluesterer (I love KDE ...)