Quote Originally Posted by LLiner View Post
BTW, what does the red warning mean?
It means zypper was unable to verify the signature on the package. If you want to be able to verify the signature you need to import the relevant key. There's insurrection on this on https://www.virtualbox.org/wiki/Linux_Downloads
Quote Originally Posted by LLiner View Post
And a minor isue: Why in YaST Software Manager VirtualBox version is shown in red? (And more other package versions)
From the Manager's tip: "It is highlighted red if the version installed is no longer being made available in any configured repository."
Never noticed that before (I very rarely use YaST for package management), but I think the relevant part of that last line is 'any configured repository'. The VirtualBox package you've got installed isn't in any of your configured repositories and so YaST indicates that by showing the version number in red. I see the same thing.