On Friday, 18 December 2020 08:00:51 GMT bobwxc wrote: > 在 2020/12/18 上午10:47, Walter Dnes 写道: > > How do I turn off UEFI secure boot... and UEFI for that matter? I > > > > want a simple bootable system. Sticking in a USB key and trying to boot > > off of it resulted in... > > > > ERROR > > > > Verification failed; (0x1A) Security Violation > > UEFI secure boot is depend on your motherboard firmware. > Please enter the BIOS when power on your computer and turn > down corresponding option. > > How to enter BIOS and where is the option is depend on your > device model, please search on web or call the service center.
Dell XPS MoBo settings menu is usually entered by pressing F2 at start up - check the manual for it. You can disable Secure Boot from the Boot menu and also select the first bootable device. The bootable device can also be selected by pressing F12 at start up. Secure Boot won't allow you changing hardware on these MoBos - unless the UEFI firmware inc. drivers has been signed by Microsoft. A lock-in some/all? OEMs and hardware manufacturers have capitulated on, unless you use the RHL shim and MOK (Machine Owner Key) manager to sign/boot GRUB and from GRUB you can then boot the OS of your choice. Simplest, slimmest solution is to disable Secure Boot, then use efibootmgr application in Linux to edit the OS kernel images ordered list in the UEFI boot menu. For multibooting different kernels/OS/devices, at any time you can press F12 at start up.
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