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Thread: virtualbox Failed to open a session for the virtual machine

  1. #1
    Join Date
    Apr 2015
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    virtualbox Failed to open a session for the virtual machine

    For three days I've got problems with the VirtualBox and I can not find a solution.


    For more than a year I have been working on a VirtualBox on Ubuntu host and a guest of windows7 It worked great, but of a few days ago can not run windows I get this message Failed to open a session for the virtual machine

    https://ibb.co/jAGrNR

    Please, your help means a lot to me
    Last edited by dragan4; January 16th, 2018 at 01:13 AM. Reason: solved

  2. #2
    Join Date
    Mar 2011
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    Ubuntu 18.04 Bionic Beaver

    Re: virtualbox Failed to open a session for the virtual machine

    Please tell us what VB version you are using.

    These threads may be useful to you: https://ubuntuforums.org/showthread.php?t=2382314
    https://ubuntuforums.org/showthread.php?t=2382282

    The latest kernel upgrade has caused problems for some VB users. In my case, installing VB 5.2 solved them. Your mileage may vary.

  3. #3
    Join Date
    Apr 2015
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    Re: virtualbox Failed to open a session for the virtual machine

    thanks a lot on the answer
    I installed version 5.2
    but it does not seem to work for me now, I get this error Failed to open virtual machine located in /media/dragan/5f066939-a6e8-457a-860e-2981b5c851be7/dragan/VirtualBox VMs/win 7/win 7.vbox.



    https://ibb.co/jEx2z6
    Attached Images Attached Images

  4. #4
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    Mar 2011
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    Ubuntu 18.04 Bionic Beaver

    Re: virtualbox Failed to open a session for the virtual machine

    1. Make sure you have a backup of all your VMs. In fact, of all your important data.
    2. Try using an older kernel.
    3. If that doesn't work, try this: https://forums.virtualbox.org/viewtopic.php?f=8&t=59357
    4. You may wish to post on the VB forums. They specialize in VB recovery. Explain your whole situation with lots of detail including the host OS, guest OS, details of kernel upgrade on host, VB version, etc. Always, the more info the better.

  5. #5
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    Apr 2015
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    Re: virtualbox Failed to open a session for the virtual machine

    thanks very much

    failed to return on the older version karnel

  6. #6
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    Ubuntu 18.04 Bionic Beaver

    Re: virtualbox Failed to open a session for the virtual machine

    Have you tried the measures in Step #3?

  7. #7
    Join Date
    Apr 2015
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    Re: virtualbox Failed to open a session for the virtual machine

    Yes, I did this but got this error now
    Attached Images Attached Images

  8. #8
    Join Date
    Apr 2015
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    20

    Re: virtualbox Failed to open a session for the virtual machine

    I managed to solve this problem ... the problem seemed to be in disagreement with the version dmks

    This helped me https://askubuntu.com/questions/9007...c-1912-rc-1912

    thanks very much DuckHook for your help

  9. #9
    Join Date
    Mar 2011
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    Ubuntu 18.04 Bionic Beaver

    Re: virtualbox Failed to open a session for the virtual machine

    My input was of very limited value, but I'm very glad you solved it.

    Good Luck and Happy Ubuntu-ing!

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