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Many tries - many errors, much searching, remain clueless... Acer Aspire E5-575 (I can use F2 to get into the BIOS) Trying to: Install Ubuntu Zesty Zapus 17.04 from USB continually get error: Default Boot Device Missing or Boot Failed. after "successful" installation I can run Ubuntu from the USB and have started Gparted and get this: The driver descriptor says the physical block size is 2048 bytes, but Linux says it is 512 bytes. Potential problem may be from this observation: I pulled out the flash drive just as the re-boot started and got all sorts of errors (about 15-20) the first of which says:

[     0.218737]  platform MSFT0101:00: failed to claim resource 1

further errors indicate it's trying to read sda where the OS was installed on /dev/sdb.

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    Did you find any of the many threads on Acer (all models) and its unique UEFI requirement of setting "trust" on grub/shim .efi boot files. Acer Aspire E15 will not dual boot, many details Trust settings in step 35 askubuntu.com/questions/627416/… & ubuntuforums.org/showthread.php?t=2358003 & ubuntuforums.org/… But Ubuntu's grub only installs to the ESP - efi system partition on sda. So make sure you have that. If external USB drive, it is more complicated. – oldfred Aug 21 '17 at 14:27
  • I found many threads - not specifically the ones oldfred put up partially because I'm not trying (right now) to dual boot - just get it to boot to 17.04. The first link, I think, involves the granting of authority during boot and my notes indicate the following:"Select an UEFI file as trusted for executing" is available HDD0 (enter> <EFI> (enter) <ubuntu> (enter) enabled 5 files for booting (by using "Yes" mixed case as the above page suggests) fwupx64.efi grubx64.efi shimx64.efi mmx64.efi fbx64.efi – TennisNutDave Aug 21 '17 at 19:03
  • The shim.efi you mentioned might be covered (above comment) by the shimx64.efi I think I gave permission to previously. I'm new posting and appreciate your help – TennisNutDave Aug 21 '17 at 19:07
  • Looking over oldfred's suggestions again I see "only installs to the ESP - efi system partition on sda" whereas my booting to my flash drive with Ubuntu comes up with the flash as sda and the hard drive as sdb. How do I make the hard drive sda? Maybe try booting from DVD and use Gparted? – TennisNutDave Aug 21 '17 at 21:19
  • I never had flash drive as sda, but have seen a few others. But have had my sdb become sdc and flash drive sdb. And found that was becuase I had skipped a SATA port. So is your hard drive in SATA0, not SATA1? If all of boot files installed back into flash drive, does flash drive now have /EFI/ubuntu folder? You may be able to copy all of that back to hard drive's ESP and edit fstab to have correct UUID of hard drive's ESP, not that of flash drive. May also need efibootmgr to add entry to UEFI menu. – oldfred Aug 21 '17 at 22:20
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  • We made many Ubuntu installs, which failed to boot.
  • Finally, in BIOS we did "Security > Restore Secure Boot to Factory Default". We reinstalled Ubuntu; it still failed to boot. Then in BIOS, "Security > Select an UEFI file as trusted for executing", we kept on HDD0, selected , and set "grubx64.efi" , "Wish to add this file?" to YES. [F10] Save and Exit. THAT booted up into Ubuntu (17.04). NO reinstall was required.

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