Oracle VirtualBox Installation on Linux

1.http://download.Virtualbox.org/virtualbox/rpm/rhel/6server/x86_64

2.download VirtualBox-4.3-4.2.24_92970_el6-1.x86_64.rpm
The rpm should version should match with VirtualBox extension pack
3.rpm - ivh  VirtualBox-4.3-4.3.8_92456_el6_1_x86_64.rpm
while installing it will create "vboxusers" group
vm users must be member in this group
useradd -G g1 CCC7usermod -G g1 s --login name for user
groupmod -n gropu1(new name) g1(old name)

4.VBoxManage extpack install /var/ftp/pub/Packages/./Oracle