Ubuntu 12.04 on Virtualbox pae error – “Unable to boot – please use a kernel appropriate for your CPU”

Hi all,

My last post was about the release of Ubuntu 12.04 LTS. I wanted to install it in the VirtualBox. But I got an error. So this post is about how to remove the error and move forward with the installation.

If you are installing the new Ubuntu 12.04 Precise Pangolin 32bit ISO on Virtualbox you are going to get this error :

“This kernel requires the following features not present on the CPU: pae Unable to boot – please use a kernel appropriate for your CPU”.

Precise Pangolin LTS [Running] - VirtualBox OSE

Precise Pangolin LTS [Running] – VirtualBox OSE pae error

To fix this error, you have to enable PAE/NX for the virtual machine.

To enable, you have to select the virtual machine and then click “Settings” and under System –> Processor, check the “Enable PAE/NX” box:

Precise Pangolin LTS - Settings

Precise Pangolin LTS – Settings

This occurs because Ubuntu 12.04 uses the PAE kernel by default for 32bit.
Hope this helps you all and saves you day.
Enjoy Ubuntu 12.04.
And if you want to enable ssh access to guest Ubuntu from host, here is the howto.

Thank you.

I am Manohar Bhattarai, a vivid java programmer. I am a keen Linux user. I currently boot Ubuntu Linux. I am a Free/Libre Open Source Software enthusiast.

Posted in Linux, Precise Pangolin, Ubuntu, Ubuntu 12.04 LTS, Virtualbox Tagged with: , , , , , , , , , , , , , , , , , , , , , ,
36 comments on “Ubuntu 12.04 on Virtualbox pae error – “Unable to boot – please use a kernel appropriate for your CPU”
  1. Oleg says:

    thx a lot, man )

  2. Blub says:

    Very helpful indeed!

  3. Akula says:

    Hi, I am not using a virtualbox. I am trying to use it as a bootable USB for the laptop and I am getting this error. Could you please help

  4. Diogo says:

    Ty brow

  5. njorl says:

    Manohar, As you’ve taken the trouble to publish this piece of help, I want to go to the (lesser) trouble of thanking you.

  6. timm says:


  7. pranee says:

    thanks a lot

  8. Thanks for this 🙂

  9. Gopal says:

    Thank you very much ! It works !!!

  10. Alvamga says:

    I would probably found this in the end, but you’ve saved me the time, effort and grief! Thanks! 🙂

  11. Vikas V says:

    Thanks for sharing the tip. It did save my day.

  12. GaganSidhu says:

    pae error is solved but when i started to install ubuntu windows7 suddenly shut downs with no warning ………………how to fix it

  13. Luca Innocenti says:

    Thank you

  14. HtmlGifted says:

    worked for me perfect thanks

  15. Thanks says:

    Thank you kind sir. I was about to give up!

  16. keziahh says:

    This is the same problem that I’ve had, but I can’t check the box because it’s blanked out. Any ideas? 🙂

    • Lou says:

      Make sure you don’t have an instance running, because you can’t click/choose it if the VM is already running. Quit it and try again.

  17. silverwing says:

    Much Love, Ty bro!

  18. Ries says:

    You just saved me from wasting hours of my life! Thank you!

  19. uday says:

    Thanks. That saved my day 🙂

  20. satish says:

    just enable PAE/NX for the vm guest. this should solve the issue.

  21. alexe says:

    А как включить этот PAE/NX из коммандной строки?

  22. Pedro M.- says:

    Thank you XD

  23. Anthony says:

    Thanks a lot !

  24. valsaraj says:

    I got the same error when I tried to install CentOS. Later it is fixed when I changed Linux type from ‘Linux’ to ‘Redhat’.


  25. Monica Infit says:

    Muchas gracias por el dato!

  26. Antonio says:

    Thanks a bunch, mate! You saved my day.

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