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I am trying to set up a virtual machine using Virtualbox:

  • Host OS: Windows 7
  • Guest OS: Ubuntu
  • Virtualbox version: 5.0.10
  • Processor: Core i7-5600U

But when I try to start the VM I got the following error:

VT-x is being used by another hypervisor (VERR_VMX_IN_VMX_ROOT_MODE). VirtualBox can't operate in VMX root mode. Please close all other virtualization programs. (VERR_VMX_IN_VMX_ROOT_MODE).

I Googled this error and from what I can understand is that I am using another virtualization software, but as far as I know I do no have anything else installed (I had VmWare player installed in the past, but I uninstalled it).

How can I find out what other virtualization software I have? Or how do I solve this problem?

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    How did you uninstall the old player? Did the deinstallation also uninstall its kernel modules (3 of those IIRC). – Hennes Nov 18 '15 at 15:50
  • I am not sure .I just did uninstall from program and feature in control panel. Not sure about the kernel module though. – manuj Nov 18 '15 at 16:12
  • AnyYou could use lsmod. If you see items like this then the uninstllation is not complete:<BR> <BR> Module Size Used by<BR> vmxnet 11200 0<BR> vmhgfs 39760 0<BR> – Hennes Nov 18 '15 at 16:26
  • Isn't lsmod for linux environment ? I am on windows 7. – manuj Nov 18 '15 at 16:35
  • @manuj545 - You tagged your question as Ubuntu. I would assume the suggestion would be to run the command within the guest OS. – Ramhound Nov 18 '15 at 19:33
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Finally solved this. My machine has bromium vsentry running. which created a mini vm. Hence the VT-x was being used by this. Uninstalled the program and virtualBox started working. Thanks all for your help

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  • This was also the root cause behind our entire department not being able to run VirtualBox. Frustratingly, local admin rights is not enough to remove Bromium vSentry - requires Domain Admin to remove :( – JBRWilkinson Dec 15 '16 at 10:41

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