After upgrading from Fedora 19 to Fedora 20 using `fedora-upgrade` per https://fedoraproject.org/wiki/Upgrading_Fedora_using_yum, I ran `package-cleanup --orphans` to find packages that were not upgraded. The following were not upgraded:

* kernel-3.11.10-200.fc19.x86_64
* kernel-3.12.5-200.fc19.x86_64
* kernel-modules-extra-3.11.10-200.fc19.x86_64
* kernel-modules-extra-3.12.5-200.fc19.x86_64
* kmod-VirtualBox-3.12.5-200.fc19.x86_64-4.3.6-1.fc19.1.x86_64

A subsequent `yum remove kmod-VirtualBox-3.12.5-200.fc19.x86_64-4.3.6-1.fc19.1.x86_64` resulted in a removal of VirtualBox.

VirtualBox was reinstalled using `yum install VirtualBox`, but with a different driver (see below).

Something seems mildly astray since an orphaned F19 component removed VirtualBox on F20. I would have expected a VirtualBox upgrade with the rest of the system; or a good package dependecy graph so VirtualBox would remain.

*****

# yum install VirtualBox
Loaded plugins: langpacks, refresh-packagekit
Resolving Dependencies
--> Running transaction check
---> Package VirtualBox.x86_64 0:4.3.6-3.fc20 will be installed
--> Processing Dependency: VirtualBox-kmod = 4.3.6 for package: VirtualBox-4.3.6-3.fc20.x86_64
--> Running transaction check
---> Package kmod-VirtualBox-3.12.5-302.fc20.x86_64.x86_64 0:4.3.6-1.fc20.1 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package                     Arch   Version        Repository              Size
================================================================================
Installing:
 VirtualBox                  x86_64 4.3.6-3.fc20   rpmfusion-free-updates  29 M
Installing for dependencies:
 kmod-VirtualBox-3.12.5-302.fc20.x86_64
                             x86_64 4.3.6-1.fc20.1 rpmfusion-free-updates 208 k

Transaction Summary
================================================================================
Install  1 Package (+1 Dependent package)

Total download size: 30 M
Installed size: 90 M
Is this ok [y/d/N]: Y
Downloading packages:
(1/2): kmod-VirtualBox-3.12.5-302.fc20.x86_64-4.3.6-1.fc20 | 208 kB   00:00     
(2/2): VirtualBox-4.3.6-3.fc20.x86_64.rpm                  |  29 MB   00:18     
--------------------------------------------------------------------------------
Total                                              1.6 MB/s |  30 MB  00:18     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : VirtualBox-4.3.6-3.fc20.x86_64                               1/2 
  Installing : kmod-VirtualBox-3.12.5-302.fc20.x86_64-4.3.6-1.fc20.1.x86_   2/2 
  Verifying  : kmod-VirtualBox-3.12.5-302.fc20.x86_64-4.3.6-1.fc20.1.x86_   1/2 
  Verifying  : VirtualBox-4.3.6-3.fc20.x86_64                               2/2 

Installed:
  VirtualBox.x86_64 0:4.3.6-3.fc20                                              

Dependency Installed:
  kmod-VirtualBox-3.12.5-302.fc20.x86_64.x86_64 0:4.3.6-1.fc20.1                

Complete!