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FIRST NOTE: I tried the solution proposed by this topic, but it did not work. Besides, the fact that I've reinstalled Windows recently could (or could not) make my situation a little different.

Some months ago, I installed Ubuntu on VirtualBox and it went fine. But I recently formatted my disk and reinstalled Windows 7. So I wanted to reinstall Ubuntu 16.04 on VirtualBox as before. Now though, I get this Kernel Panic message as I'm trying to install the 'i386 Desktop' version:

enter image description here

Here's my VM's configuration:

enter image description here

The 64-bit version of Ubuntu 16.04 doesn't work ; it says it can't detect my 64-bit CPU (guess VirtualBox is made only for 32-bit Ubuntu). I've tried installing the 32-bit version of Ubuntu 14.04.4, but the same kernel panic message appeared. I've also tried the tips from this answer to a similar topic, but it didn't work.

I know little about OSs, so I'm sort of stuck here. I don't know if the fact that I reinstalled Windows 7 recently is relevant. I'll provide the files you ask for (but please indicate clearly how I can find them).

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    Try with 64bit VirtualBox. My guess is that you've downloaded VBox 32bit version
    – ForceMagic
    Apr 24, 2016 at 21:44
  • Possible duplicate of Kernel Panic when booting ubuntu 12.04 LTS in virtualbox
    – user527600
    Apr 24, 2016 at 22:12
  • @Windowsinsider BoomTech As I stated at the end of my question, I saw that thread, but it didn't work.
    – adentinger
    Apr 25, 2016 at 1:04
  • @ForceMagic As you suggested, I've uninstalled and reinstalled VirtualBox from Oracle's website, rather than VirtualBox's. There is apparently only 1 version of VirtualBox for Windows, which does both x86 and x64. So I basically reinstalled the same software I had before. I then made a new Ubuntu VM, but it didn't help. I still get the same panic error.
    – adentinger
    Apr 25, 2016 at 1:09
  • "The 64-bit version of Ubuntu 16.04 doesn't work" That's weird... I have the 64-bit version working fine on VirtualBox over here. I'm pretty sure the guest is limited by the host, so can you confirm you've installed Windows 7 64-bit?
    – wjandrea
    Apr 25, 2016 at 5:28

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