Comment 58 for bug 1886148

@Norbert (nrbrtx) , reference comment #55

I also found it strange that Rufus failed so explored th matter abit further.
Here is what I found in the Rufus log file.

"ISO analysis:
  Image is an ISO9660 image
  Detected EFI bootloader(s) (from '/boot/grub/efi.img'):
  ● 'bootx64.efi'
Could not get ISO-9660 file information for file boot/grub/i386-pc/normal.mod
  Could not read Grub version from 'boot/grub/i386-pc/normal.mod'
  Could not detect Grub version
Disk image analysis:
  Image has an unknown Master Boot Record
  Image is a bootable disk image
ISO label: 'Lubuntu 20.10 amd64'
  Size: 1.7 GB (Projected)
  Note: File on disk is larger than reported ISO size by 4.8 MB...
  Uses: EFI (through '/boot/grub/efi.img')
  Note: This ISO uses symbolic links, which will not be replicated due to file system limitations.
  Because of this, some features from this image may not work...
Using image: groovy-desktop-amd64.iso (1.7 GB)"

Note that the Grub version could not be read or detected ..