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So I had virtual box working perfectly before I decided to do a complete system wipe recently. Upon re-installing a 64 bit version of Ubuntu 13.04 and running a full upgrade, I attempted to set my virtualbox up again; however when ever I try to start my VM, I receive the following error:

Failed to open a session for the virtual machine Windows 7 x64 Ultimate.
VT-x is not available. (VERR_VMX_NO_VMX).
Result Code: NS_ERROR_FAILURE (0x80004005)
Component: Console
Interface: IConsole {db7ab4ca-2a3f-4183-9243-c1208da92392}

I'm using the OSE version from the Ubuntu Software Center. I also tried the PUEL edition from oracle's website, no luck.

Any help?

Michael
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  • Is VT-x enabled in your machine's BIOS? – Takkat Sep 07 '13 at 19:42
  • I can't find the option in my BIOS. – Michael Sep 08 '13 at 04:12
  • see e.g.: http://askubuntu.com/questions/256792/how-do-i-enable-hardware-virtualization-technology-vt-x-for-use-in-virtualbox it may have different names though. – Takkat Sep 08 '13 at 08:04
  • get in touch with system manufacturer/ motherboard manufacturer's web site /google for bios manual. .. It should be physical hardware bios related.. you have to enable all necessary featuresfrom bios for virtual box to work with vt .. Its different from pc model to model .. for example see this http://askubuntu.com/questions/607897/no-option-for-64-bit-os-virtualbox-guest-os-in-ubuntu-14-10-dell-optiplex-755 – Aravinda May 20 '15 at 10:03
  • I found a solution in a forum, but i don't know if it works; try to type the following command VBoxManage modifyvm <vmname> --longmode off where <vmname> is your virtual machine name – Bilal Sep 01 '15 at 19:11

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