If you have an Ubuntu install, anywhere, you can copy it from /boot/efi/EFI/Boot. You may have to change permissions on mount in fstab to be able to see that partition. My install of 19.10 created these:
Code:
fred@Bionic-Z170N:/media/fred/ESP_B/EFI/BOOT$ ll
-rw-r--r-- 1 fred fred 1334816 Oct 15 14:00 BOOTX64.EFI
-rw-r--r-- 1 fred fred 1213032 Oct 15 14:00 fbx64.efi
-rw-r--r-- 1 fred fred 1269496 Oct 15 14:00 mmx64.efi
If you just have live installer, it should be in the /EFI/BOOT/ folder on your flash drive.
My ISO for 19.10 shows this, do not now normally use flash drives, but you should have same files in flash drive:
Code:
fred@Bionic-Z170N:/media/fred/Ubuntu 19.10 amd64/EFI/BOOT$ ll
total 3922
dr-xr-xr-x 1 fred fred 2048 Oct 14 16:02 ./
dr-xr-xr-x 1 fred fred 2048 Oct 14 16:02 ../
-r--r--r-- 1 fred fred 1334816 Oct 14 16:02 BOOTx64.EFI
-r--r--r-- 1 fred fred 1406840 Oct 14 16:02 grubx64.efi
-r--r--r-- 1 fred fred 1269496 Oct 14 16:02 mmx64.efi
If file is really there in your flash drive installer, then change UEFI settings. Or try a different tool to create installer.
Some now have settings that may make it UEFI only or BIOS only, and then you have to be sure to boot flash drive in that mode.
You really want to boot in UEFI boot mode.
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