Hello halfgaar, our knowledge base article includes some instructions
for Amazon ec2 instances on how to recover from this situation:

https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass#Cloud_instances_.28e.g._AWS_EC2.29

If the virtual console support provides a mechanism to supply boot
media, you could boot into a rescue / live environment, chroot into your
existing installation, and run dpkg-reconfigure grub-pc. If the virtual
console support doesn't provide the ability to provide temporary boot
media, then the longer, more complicated, instructions will be required.

Thanks

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https://bugs.launchpad.net/bugs/1889556

Title:
  grub-install failure does not fail package upgrade (and does not roll
  back to matching modules)

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