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how to install oracle virtualbox 4.*

Install VirtualBox 4.0.8 on Fedora 15/14, CentOS/Red Hat (RHEL) 5.6/6

Virtualbox-logo-smallOracle VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for
enterprise as well as home use. VirtualBox is a general-purpose full virtualizer for x86 hardware.
Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization
solution that is also Open Source Software.
VirtualBox supports a large number of guest operating systems: Windows 3.x, Windows NT 4.0,
Windows 2000, Windows XP, Windows Server 2003, Windows Vista, Windows 7, DOS, Linux (2.4 and
2.6), Solaris, OpenSolaris, OpenBSD.

This guide shows howto install VirtualBox 4.0 (currently 4.1.2) on Fedora 15, Fedora 14, Fedora 13,
Fedora 12, CentOS 5.6, Red Hat (RHEL) 5.6 and Red Hat (RHEL) 6. This howto uses Virtual Box yum
repositories.

1. Change to root User
su -
## OR ##
sudo -i
2. Install Fedora or RHEL Repo Files
cd /etc/yum.repos.d/
## Fedora 15/14/13/12 and RHEL 6 users
wget http://download.virtualbox.org/virtualbox/rpm/fedora/virtualbox.repo
## CentOS 5.6 and RHEL 5.6 users
wget http://download.virtualbox.org/virtualbox/rpm/rhel/virtualbox.repo
3. Update latest packages
yum update
Note: Reboot if you got kernel update.
4. Install following dependency packages
yum install gcc kernel-devel kernel-headers
## PAE kernel users install ##
yum install gcc kernel-PAE-devel kernel-headers
5. Install VirtualBox Latest Version (current 4.0.8)
yum install VirtualBox-4.0

Note:
This command create automatically vboxusers group and VirtualBox user must be member of that
group.
This command also build needed kernel modules.
6. Add VirtualBox User to vboxusers Group
usermod -a -G vboxusers user_name
7. Start VirtualBox
Use launcher or simply:
VirtualBox

Troubleshooting
If you have problems with KERN_DIR parameter or your kernel directory is not automatically detected
then set KERN_DIR environment variable manually, using following method:
## Current running kernel on Fedora ##
KERN_DIR=/usr/src/kernels/`uname -r`
## Current running kernel on CentOS and Red Hat (RHEL) ##
KERN_DIR=/usr/src/kernels/`uname -r`-`uname -m`
## Fedora example ##
KERN_DIR=/usr/src/kernels/2.6.33.5-124.fc13.i686
## CentOS and Red Hat (RHEL) example ##
KERN_DIR=/usr/src/kernels/2.6.18-194.11.1.el5-x86_64
## Export KERN_DIR ##
export KERN_DIR
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