My guess is lodygin fails to boot from the network, and cycles all the
way to booting from Hard drive (0004), in which case, since shim and
everything really /are/ installed on disk, it gets run to recreate the
missing "ubuntu" entry.

Assuming you can reproduce this issue easily, can you check if it can be
reproduced after removing the 0004 boot entry?

sudo efibootmgr -b -B 0004

** Changed in: grub2 (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1790586

Title:
  The proposed grub package in Trusty / Bionic overrides the boot order
  on a MaaS deployed system

Status in ubuntu-kernel-tests:
  Confirmed
Status in grub2 package in Ubuntu:
  Incomplete
Status in linux package in Ubuntu:
  Invalid

Bug description:
  Similar to bug 1642298, bug 1750732 and bug 1788539

  This issue was only spotted on ThunderX Cavium ARM64 system and an AMD
  Naples amd64 server in this SRU cycle.

  Steps:
  1. Deploy the ThunderX system with Trusty + T-LTS 4.4 kernel (It works fine 
with just Trusty, however this was tested on the AMD Naples, not ThunderX since 
it does not support 3.13 kernel)
  2. Check the efibootmgr output
  3. Enable proposed, install grub-common
  4. Check efibootmgr again

  Result:
  In step 2, the boot order is correct:
  ubuntu@wright-kernel:~$ sudo efibootmgr
  BootCurrent: 0002
  Timeout: 10 seconds
  BootOrder: 0002,0000,0003,0004,0001
  Boot0000* ubuntu
  Boot0001  UEFI: Built-in EFI Shell
  Boot0002* UEFI: IP4 Ethernet vNIC Controller 62:54:CA
  Boot0003* UEFI: IP4 Ethernet vNIC Controller 62:54:CB
  Boot0004* UEFI: IP4 Ethernet vNIC Controller 62:54:CC

  But in step 4, the boot order will be overridden:
  ubuntu@wright-kernel:~$ sudo efibootmgr
  BootCurrent: 0002
  Timeout: 10 seconds
  BootOrder: 0000,0002,0003,0004,0001
  Boot0000* ubuntu
  Boot0001  UEFI: Built-in EFI Shell
  Boot0002* UEFI: IP4 Ethernet vNIC Controller 62:54:CA
  Boot0003* UEFI: IP4 Ethernet vNIC Controller 62:54:CB
  Boot0004* UEFI: IP4 Ethernet vNIC Controller 62:54:CC

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: grub-common 2.02~beta2-9ubuntu1.15
  ProcVersionSignature: User Name 4.4.0-134.160~14.04.1-generic 4.4.140
  Uname: Linux 4.4.0-134-generic aarch64
  ApportVersion: 2.14.1-0ubuntu3.29
  Architecture: arm64
  Date: Tue Sep  4 07:45:19 2018
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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