If your PC does have an option to disable Secure Boot, you'll find it on the UEFI firmware settings screen. To access these options, hold down the Shift key on your keyboard and click the "Restart" option in the Start menu, Start screen, or Settings charm. Your computer will reboot into an advanced startup options menu. Select "Troubleshoot," "Advanced Options," and then "UEFI Firmware Settings."
This should take you to your computer's UEFI settings screen, which will look different on each computer. Look for a category named something like "Security" or "Boot." Find the "Secure Boot" option and disable it. You can now save your settings and reboot your computer. Secure Boot will be disabled and you can boot Linux or any other operating system.
The process may be a bit different on some computers--you might have to press a key during the boot process to access the UEFI settings screen. Search the web for your model of computer (or motherboard, if you built your PC yourself) and "disable Secure Boot" if you can't find the option.
Windows itself doesn't require Secure Boot to run, so your Windows system will continue to boot and work properly with Secure Boot disabled--just as if you installed Windows 10 or 8.1 on an older PC without Secure Boot capabilities. If you want to re-enable Secure Boot in the feature, visit the UEFI settings screen again and switch it back on.
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