I have tried many tutorials that give explicit steps for installing VirtualBox on CentOS 7, but none of them go to completion without throwing errors.  Some of the tutorials assume that you will have access to a GUI.  THERE IS NO GUI ON THE CENTOS 7 SERVER ON WHICH I NEED TO INSTALL VIRTUALBOX.  Most recently, I have tried following the instructions from this tutorial, which claims to show how to install VirtualBox on a minimal, terminal-only installation of CentOS 7.  But following the instructions results in a message indicating that there is no package VirtualBox-5.0 to install.  Note that I have followed the instructions exactly, with the only exception that I updated the version names with urls from the Oracle web site.  Also note that I did a clean install of CentOS before taking the following steps:  [root@localhost ~]# yum groupinstall 'Development Tools' SDL kernel-devel kernel-headers dkms.......................................Complete![root@localhost ~]# cd /etc/yum.repos.d/[root@localhost yum.repos.d]# wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc[root@localhost yum.repos.d]# rpm --import oracle_vbox.asc[root@localhost yum.repos.d]# yum update && yum install VirtualBox-5.0........installed/updated lots of other stuff automaticallyComplete!Loaded plugins: fastestmirrorLoading mirror speeds from cached hostfile * base: centos.sonn.com * extras: centos.sonn.com * updates: centos.sonn.comNo package VirtualBox-5.0 available.Error: Nothing to do[root@localhost yum.repos.d]#   What am I doing wrong?  What can I change in the above in order to successfully install VirtualBox-5.0?
yum No package VirtualBox-5.0 available. on a MINIMAL installation of CentOS 7?
centos;yum;virtualbox;virtual machine