I'm trying to install Ubuntu 18.04 on a Lenovo T470. It currently has Windows 10. In System Properties it shows Windows 10, 64-bit OS, x64 processor.
When I try to install Ubuntu from pen drive nothing happens, so tried xboot QEMU to emulate. In QEMU it showed the error
This kernel requires an x86-64 CPU, but only detected an i686 CPU.
I searched for this issue on Ask Ubuntu, and I found that the solutions provided were for setting up Ubuntu in virtual machines by enabling virtualization from BIOS, so I enabled virtualization from BIOS and tried again... but got the same error.
Some other answers suggest downloading and burning a 64-bit image, which I already have, but it didn't work.
I tried with an old Lubuntu-i386 image and surprisingly it worked.
What's the problem and how can I fix it?