Ananth's picture


Host:  Windows 2008 R2(64-bit) on IBM eServer 326, AMD Opteron 250 x64

VM: turnkey-mediawiki-12.1-squeeze-amd64 on VirtualBox-4.2.16-86992-Win

At boot getting the below error.

"This kernel requires an x86-64 CPU, but only detected an i686 CPU. Unable to boot - Please use a kernel appropriate for your CPU"

Read somewhere that i686 means 32 bit intel cpu! but then how did we install 2008 R2 in that?

We already have a previous version of Turnkey MediaWiki running on the exact same hardware but Windows 2003 Server 32 bit on VMWare Server.

We tried the new VM on the above mediawiki running server and got the same error. So its not OS, processors are the same, Sorry no lights on our thick heads! :-(

Please advice.



Ananth's picture


Thanks Tim, Got it now! 

Great Help :-)

Jeremy Davis's picture

Theoretically if you are running x64 Windows then you can run an x64 (i.e. amd64) VM. However it will depend on whether you have virtual extensions enabled in the host BIOS (i.e. supports allowing the full CPU options through to the VM). Also it will depend on the VM platform that you use - you may need to tweak some settings somewhere...

If you are ok with the 32 bit version (i.e. i686) then no worries, but if you want to try to run the 64 bit version then I suggest you see if your VM platform provider has some support mechanism (such as forums, mailing list or even a wiki) to assist you configuring your host to support 64 bit guests.

Hale's picture

"Opteron 250 x64"


ehm.. it seems like VM has problems with x64, or x64 was not configured in VM profile.

technically, if not speaking about VTx differences and some multimedia extensions, AMD and Intel x64 are the same. So, you can even disable VTx and still run the code on VBOX or VMWare (with disabled vtx option, of course).

STWIV's picture


I am trying to install Joomla 2.5 on my Windows 2008 32bit server which has an intell processor and I am receiving the Kernel error above.

I am only seeing AMD downloads, and I triel the link to the Morror Sites, but none are listed.

Has the mirror site been changed?

Thanks in advance

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