This is presumably because you are on a system using UEFI with
SecureBoot, and therefore the loading of external grub modules fails
('insmod udf'), and we do not build udf support into the signed UEFI
GRUB image.

Because the UEFI GRUB image is signed into the SecureBoot regime as
trusted code, the standards for security are higher, and we would no
simply enable an additional filesystem driver without some measure of
security review.

** Package changed: syslinux (Ubuntu) => grub2 (Ubuntu)

** Changed in: grub2 (Ubuntu)
   Importance: Undecided => Wishlist

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https://bugs.launchpad.net/bugs/1820222

Title:
  Unable to boot LiveCD ISO from UDF filesystem

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