Fedora tutorial, How to install Guest Additions on Fedora 24. This tutorial is a bit outdated but I think there are many new Fedora users that wondering how to run Fedora 24 on Virtualbox with all features enabled. Installing Guest Additions on Fedora 24 needs extra works by installing several packages prior to the guest additions installation itself.
First, open Terminal and paste the following command on Fedora. Run this command as root
dnf --showduplicates --allowerasing --releasever=22 downgrade xorg-x11-server-Xorg
Now followed with this command to update Kernel.
dnf update kernel*
Now install these packages
dnf install dkms kernel-devel
I suggest you to reboot Fedora 24 after all these installation and configurations. Upon reboot, you can try to install Guest Additions and now should works.