I have been attempting delete Windows 10 and clean install Ubuntu 16.04.3 LTS on my Samsung R730 laptop.
While the installer ran without an issue, when booting from hard drive the only response was a flashing underscore. The hard drive was detected, but could not be booted.
I ran boot-repair from the Ubuntu trial. The paste is available here. When booting this leads to a new error:
Failed to open \EFI\BOOT\grubx64.efi – Not Found Failed to load image \EFI\BOOT\grubx64.efi: Not Found start_image() returned Not Found
I have noticed the boot-repair paste states that “No boot loader is installed in the MBR of /dev/sda”. This answer indicates that I can ignore this.
\EFI\BOOT\grubx64.efi is not in the list of boot files for the hard disk (SDA). directory, however it is present in the installation USB. In fact the hard drive doesn't have an \EFI directory at all. To my knowledge I can’t simply copy this directory over, however I might be wrong.
What can I do to install the