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a60fb26
(Get the code!)
(Additional notes)
Disclaimer: I've discovered these cloud-init details while troubleshooting this issue involving Azure, Ubuntu, GRUB, EFI, and Packer. My knowledge of cloud-init and grub EFI support is fresh and very limited.
This seems like a cloud-init issue given that cc_grub_dpkg.py exists in the first place to patch the `grub-pc` debconf key in cloud environments.
On the flip side, the GRUB prompt and shim-signed bug linked above could mean a fix should be elsewhere, maybe even in the Azure "gen 1" Ubuntu image. grub-efi* and shim-signed are marked as 'essential' packages in APT.
Apologies I don't have the full cloud-init logs, I may need to setup a test environment to collect them.
This issue may have existed for months. We only detected it after OS disks on new Azure VMs started to receive new serial IDs, a change I was unable to trace. Other factors triggered this for us recently.