This is a step by step tutorial on how to get VirtualBox 3 up and running on Fedora 12. Specifically, this guide was written using the VirtualBox 3.0.8 version and an i386 CPU (32-bit). It can be adapted to upcoming versions and different CPUs (64-bit). The folks at VirtualBox have made it easy to install for Fedora users and I’m going to show you how in a few easy steps. Right, open a terminal window and let’s get to it...
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1.) Become Priviledged

su -

2.) Get the VirtualBox repo installed

wget http://download.virtualbox.org/virtualbox/rpm/fedora/virtualbox.repo && cp virtualbox.repo /etc/yum.repos.d/

3.) Install VirtualBox (along with a few other needed packages)!

yum install -y VirtualBox dkms kernel-devel make automake autoconf gcc

Just so you know, DKMS will “ensure that the VirtualBox host kernel modules (vboxdrv, vboxnetflt and vboxnetadp) are properly updated if the linux kernel version changes during the next kernel update.”

4.) Run the setup file for VirtualBox:

/etc/init.d/vboxdrv setup

If you’re having issues here, try installing “kernel-PAE-devel”

5.) Add yourself to the “vboxusers” group and fix the SELinux Permissions:

usermod -G vboxusers -a username

chcon -t textrel_shlib_t /usr/lib/virtualbox/VirtualBox.so

6.) Run, and enjoy!

VirtualBox