Yum / Rpm Kernel Problems – CentOS 7.2

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This is the second time I have come across a problem with yum / rpm and kernel packages with CentOS 7. I install CentOS7 and do a yum update I add elrepo epel and virtualbox repos I install Virtualbox-5.0
It fails to install it give a message similar to :
– WARNING: The vboxdrv kernel module is not loaded. Either there is no module
available for the current kernel (3.10.0-327.el7.x86_64) or it failed to
load. Please recompile the kernel module and install it by

sudo /sbin/rcvboxdrv setup

You will not be able to start VMs until this problem is fixed.
5.0.14r105127

As I had done a yum update the kernel was actually 3.10.0-327.4.5.el7

The initial install did not include kernel-devel so I yum install kernel-devel Still have the problem So I downgrade the kernel – it goes to 3.10.0-327.4.4.el7
I downgrade repeatedly until I get 3.10.0-327.el7.x86_64 as that was the initial kernel installed. The downgrade correctly downgrades the kernel, kernel-headers, kernel-tools and kernel-tools-libs BUT NOT the kernel-devel which stays at -327.4.5.el7
Trapped – didn’t see that for a while!
So I finally yum remove kernel-devel Then I look in yumex (with show latest – disabled) and only the kernel-devel for 3.10.0-327.4.5.el7 is shown. All the other kernel packages show the correct versions. At this point the only installed kernel rpms are 3.10.0-327.el7.x86_64
So I explicitly ask yum to install sudo yum install kernel-devel-3.10.0-327.el7.x86_64

so now I have
>rpm -qa |grep kernel kernel-tools-libs-3.10.0-327.el7.x86_64
kernel-3.10.0-327.el7.x86_64
abrt-addon-kerneloops-2.1.11-36.el7.CentOS.x86_64
kernel-headers-3.10.0-327.el7.x86_64
kernel-tools-3.10.0-327.el7.x86_64
kernel-devel-3.10.0-327.el7.x86_64

The virtual box command to compile and install the vbox driver is sudo
/sbin/rcvboxdrv which seems to have issues sudo /sbin/rcvboxdrv

** (pkttyagent:3047): WARNING **: Unable to register authentication agent: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name
:1.6 was not provided by any .service files Error registering authentication agent:
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name :1.6 was not provided by any .service files (g-dbus-error-quark, 2)

zero idea of what that means

a repeat of the command returns nothing but when I run
>sudo VBoxManage -v WARNING: The vboxdrv kernel module is not loaded. Either there is no module
available for the current kernel (3.10.0-327.el7.x86_64) or it failed to
load. Please recompile the kernel module and install it by

sudo /sbin/rcvboxdrv setup

You will not be able to start VMs until this problem is fixed.
5.0.14r105127

BTW the setup param returns Bad argument setup

At this point I have run out of ideas / patience / time and coffee. Any ideas as to how to fix this would be appreciated. TIA
Rob

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