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  • "the boot fails" what appears on screen? I've used Ubuntu with secured boot enabled in the past just fine, dunno if it supported in the server versions though
    – athosbr99
    Commented Jul 9, 2017 at 2:39
  • 1
    ALL Windows 8 and Windows 10 devices are required by Microsoft, in order to be sold with Windows 8 an Windows 10, to be able to disable Secure Boot. The only exception to this rule was Windows RT, which your device cannot run, so the exception doesn't apply to your device. So the option must be there, if your laptop, even supports Secure Boot. Windows 7 devices sold didn't support the UEFI revision that supported Secure Boot, your laptop appears to have supported Windows XP which means, you don't even have UEFI. Only Windows 8 and Windows 10 devices supported Secure Boot.
    – Ramhound
    Commented Jul 9, 2017 at 3:19
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    Your inability to boot to the installation USB, likely has nothing to do with Secure Boot, and everything to do with how it was created.
    – Ramhound
    Commented Jul 9, 2017 at 3:19
  • Perhaps, but I have been able to successfully boot from this USB drive on my laptop. I guess I'll call Toshiba support tomorrow. Commented Jul 9, 2017 at 4:48