[Bug 2044549] Re: pxe boot on arm64 stopped working

[Dmytro Kazantsev]

The workaround for this issue is to manually replace bootaa64 and
grubaa64 files in Maas /car/snap/maas/common/Maas/image-
storage/bootloaders/UEFI/arm64 with files of previous version 2.04.

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https://bugs.launchpad.net/bugs/2044549

Title:
  pxe boot on arm64 stopped working

Status in grub2 package in Ubuntu:
  Invalid

Bug description:
  We have a lab with eight arm64 machines which are deployed from MAAS (also on arm64). 
  Two weeks ago we noticed the commissioning in MAAS is not working.
  We can see MAAS sends two files (bootaa64.efi and grubaa64.efi) as requested and then machine goes to grub prompt.
  @alexsander-souza from MAAS team had a look and he suspects grub issue. net_bootp command returns "error: couldn't send  network packet".
  Sometimes when machine is power cycled it can deploy again, but not always.
  Any idea how to debug this?

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