Hi,
I think the correct fix for you is to just get rid of grub-legacy-ec2.
It is not generally a apckage you'd want on a system with a touchpad.
(the error you see is also not likely related to the touchpad).
if this is still a problem for you, please update the bug. and move it
back to "New" status.
** Changed in: cloud-init (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1770572
Title:
package grub-legacy-ec2 18.2-4-g05926e48-0ubuntu1~16.04.2 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 127
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