I was trying to install Ubuntu 32 bits in Virtualbox but the following error occurred
this kernel requires an x86-64 cpu but only detected an i686 cpu unable to boot please use a kernel appropriate for your CPU
Then I activated EFI in the settings. The previous error message disappeared but I got another page:
UEFI interactive shell v2.0.UEFI v2.31 (EDK IT.Ox00010000). Revision 1.02 mapping table ......
What should I do to install Ubuntu?