GRUB error: unknown file system

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recheck info

inxi  -Mxa ( check for UEFI only , not UEFI[legacy] or Bios )
test -d /sys/firmware/efi && echo efi || echo bios

in your Bios

  • disable secure boot
  • disable fastboot
  • disks on AHCI
  • no legacy
  • no CSM
  • UEFI only or others ( not windows )

you should see
UEFI < USB vendor name > < patrition 1 > --> boot in EFI
is ko if you get UEFI[legacy] on boot USB iso manjaro

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