To see the error on the VGA console of an AWS EC2 instance:

apt-get install netpbm gocr
aws --output=text ec2 get-console-screenshot --instance-id $InstanceId --query 
ImageData | base64 -d | jpegtopnm | gocr -

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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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