Back to Security tab, enter "Select an UEFI as Trusted for Executing", HDD0 (or change if other drive).In Security tab, execute "Restore Secure Boot to Factory Default", then reboot once more into UEFI/BIOS with F2.By default every laptop comes with UEFI boot. Make sure a security management password is set, so to enable several of the functions, and that Secure Boot is enabled (initially, for same reason) in the Boot tab. Today in this video we would know how to enable external boot for AcerAspireE15.Enter UEFI (BIOS) with F2 once Acer appears.Install Ubuntu (it worked with 18.04 and 20.04) from a USB drive.One therefore needs to fiddle in the UEFI (BIOS) configuration to make an Ubuntu-only installation bootable: But after installing Ubuntu and formatting the HDD in the process, an error appeared at boot-up: "Default Boot Device Missing or Boot Failed", or "No Bootable Device", probably once the UEFI/BIOS has been cleared. I first had dual-boot for a couple of years, but then wanted to delete Windows and recover that partition. Press F9 and then ENTER to load the default configuration. ![]() As soon as the first logo screen appears, immediately press the F2 key, or the DEL key if you have a desktop, to enter the BIOS. Further to Piyush, this is also how I solved this problem on my Acer Aspire e5 575. Use the following steps to resolve this situation: Hold the power-button for 5 seconds to power off the device.
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