I believe your efi system partition is corrupt. You could confirm this
by checking /var/log/syslog for more detailed errors at the time this
happened, and can fix it by unmounting it and running dosfsck on it.
Please let us know how this goes.
** Changed in: grub2 (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1526608
Title:
package grub-efi-amd64 2.02~beta2-9ubuntu1.6 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1 - on macbook pro
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