While installing Ubuntu in VirtualBox, I got error messages:
This kernel requires X86-64 CPU,but only detected an i686 CPU. Unable to boot- please use a kernel appropriate for your CPU.
How do I download the appropriate kernel?
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I am also quite new, but I think you need to download the 32-bit version (i386). You will find it here http://releases.ubuntu.com/16.04/
Hope this helps!