The error message shown by shim in the screenshot is:

 Malformed binary after Attribute Certificate Table
 datasize: ? SumOfBytesHashed: ? SecDir->Size: ?
 hashsize: ? SecDir->VirtualAddress: 0x002E6088

Something is wrong here.  These '?' are the result of a printf %u format
string... that shouldn't happen.

Not having right output makes it difficult to further debug and confirm
whether this is a problem with shim or the uefi network driver or the
grub binary or the tftp server.

Opening a shim task.

** Also affects: shim (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: shim (Ubuntu)
       Status: New => Confirmed

** Changed in: shim (Ubuntu)
       Status: Confirmed => Triaged

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https://bugs.launchpad.net/bugs/1789319

Title:
  Unable to load shimx64.efi using iPXE over UEFI

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