I submitted a v2 for the Azure kernels:

https://lists.ubuntu.com/archives/kernel-team/2021-January/116454.html
https://lists.ubuntu.com/archives/kernel-team/2021-January/116455.html
https://lists.ubuntu.com/archives/kernel-team/2021-January/116456.html
https://lists.ubuntu.com/archives/kernel-team/2021-January/116457.html

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https://bugs.launchpad.net/bugs/1908264

Title:
  Disable Atari partition support for cloud kernels

Status in linux-aws package in Ubuntu:
  In Progress
Status in linux-azure package in Ubuntu:
  Invalid
Status in linux-azure-4.15 package in Ubuntu:
  Invalid
Status in linux-aws source package in Xenial:
  Fix Committed
Status in linux-azure source package in Xenial:
  Invalid
Status in linux-azure-4.15 source package in Xenial:
  Invalid
Status in linux-aws source package in Bionic:
  Fix Committed
Status in linux-azure source package in Bionic:
  Invalid
Status in linux-azure-4.15 source package in Bionic:
  In Progress
Status in linux-aws source package in Focal:
  Fix Committed
Status in linux-azure source package in Focal:
  In Progress
Status in linux-azure-4.15 source package in Focal:
  Invalid
Status in linux-aws source package in Groovy:
  Fix Committed
Status in linux-azure source package in Groovy:
  In Progress
Status in linux-azure-4.15 source package in Groovy:
  Invalid
Status in linux-aws source package in Hirsute:
  In Progress
Status in linux-azure source package in Hirsute:
  Invalid
Status in linux-azure-4.15 source package in Hirsute:
  Invalid

Bug description:
  [Impact]
  Atari partition tables have very broad specifications, and can spontaneously 
show up on uncleared disks with "garbage" data. There have been reports of 
misinterpreted AHDI partition tables before (see [0] and [1]), usually as an 
unintended side-effect of using non-zeroed disks. Users of this specific 
partition scheme are unlikely to be on AWS instances, so we should disable them.

  [0] 
https://lore.kernel.org/linux-block/1467736712-11825-1-git-send-email-kris...@linux.vnet.ibm.com/
  [1] https://mail-index.netbsd.org/port-atari/1995/11/19/0001.html

  [Test Case]
  Ensure that CONFIG_ATARI_PARTITION is not set in /boot/config-$(uname -r)

  [Fix]
  Unset CONFIG_ATARI_PARTITION in debian.aws/config/config.common.ubuntu

  [Regression Potential]
  There could be unexpected dependencies on Atari partitions that are impacted 
by this change. Considering Atari hardware hasn't been produced in a long time, 
and is unlikely to be used in AWS instances, the regression potential should be 
very low.

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