Fix: Can't re-enable UEFI plus secure boot in Dell laptops
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XPS 13 9343: Cómo instalar la edición para desarrolladores de Ubuntu 14.04 en un equipo Dell configurado para el BIOS Unified Extensible Firmware Interface (UEFI, Interfaz de firmware extensible unificada) | Dell Argentina
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Add a UEFI boot entry in Dell BIOS – c800
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Fix: Can't re-enable UEFI plus secure boot in Dell laptops
Boot Sequence in BIOS is empty, Legacy option is greyed! - Dell Community
Solved: Latitude 5590, UEFI Boot sequence empty - Dell Community