[vbox-dev] linux - how to obtain extension pack compatible with build from svn source

Klaus Espenlaub klaus.espenlaub at oracle.com
Mon Sep 20 20:25:22 GMT 2021

Hi John,

you have to use an extension pack suitable for 6.1.97, which you can 
(usually) get from https://www.virtualbox.org/wiki/Testbuilds - from the 
"Development snapshots" section. The 6.1.26 extension pack will not work 
with what will eventually be the next major/minor VirtualBox version. 
Too many big changes.


On 2021-09-20 19:32, John Lumby wrote:
> I am running linux-5.14.3  and build VirtualBox from source (in order 
> to get the VNC server).
> I hit known problems building from 6.1.26 source and so tried svn 
> checkout of current revision 91035.
> Build went perfectly including kernel modules.
> I then installed the latest 6.1.26 ExtensionPack.
> However startvm of any VM fails with this
> Oracle VM VirtualBox Headless Interface 6.1.97
> (C) 2008-2021 Oracle Corporation
> All rights reserved.
> Starting virtual machine:
> Operation failed: NS_ERROR_FAILURE
> Error: failed to start machine. Error message: Failed to construct 
> device 'usb-ehci' instance #0 (VERR_PDM_DEVHLP_VERSION_MISMATCH)
> Is there any way to get an ExtensionPack corresponding to 
> revision 91035?   I don't see that mentioned in the wiki anywhere.
> Alternatively is there some code change I can make to the 
> revision 91035 build that makes it compatible with ExtensionPack-6.1.26?
> Or must I lose USB-2?
> Cheers,   John Lumby
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