Fedora 23 and VirtualBox: VBox Guest Additions not working properly
I have just upgraded to 23 from 22 in a virtual machine using dnf as
decribed in the Fedora Wiki, which went rather smoothly for me.
After manually installing the Guest Additions, the features "seemless
windows" and "automatic resize of the guest desktop" don't work (the
respective options in the views menu are greyed out).
The VBox kernel modules are built ok, but I get a warning saying:
"unsupported pre-release version of X.Org server installed. Not
installing the X.Org drivers."
The X log says that there is X.Org X Server 1.17.99.902 installed, which
*is* a pre-release. I guess downgrading might cure the problem, but how?
Any advice from the wise persons on this list would be greatly appreciated.