For some reason the existing operating system (Fedora is giving kernel panic error) so I decided to install Ubuntu 16.04.5 LTS desktop version. When I boot from a bootable USB it just shows 2 options (no option for "Try Ubuntu Without installing"):

  • Ubuntu without ACPI off
  • Ubuntu with ACPI off

The main problem I'm facing is the error "Error 15 file not found".


  1. I had tried it with Ubuntu 18.04.2 LTS desktop, it gave the same error. Here's the screenshot of the same: enter image description here
  2. I can't access the existing OS.

Thanks for the answer(s). I solved it today. It was finding grub4dos because I was booting in legacy mode. I changed the boot option to UEFI and used rufus to create a bootable USB.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.