You appear to be using a custom kernel that is installed incorrectly.
Specifically it is missing its modules.{order,builtin} files.
** This bug is no longer a duplicate of bug 1351414
package grub-pc 2.02~beta2-9ubuntu1 failed to install/upgrade: ErrorMessage:
subprocess installed post-installation script returned error exit status 1
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1359268
Title:
package grub-pc 2.02~beta2-9ubuntu1 failed to install/upgrade:
ErrorMessage: subprocess installed post-installation script returned
error exit status 1
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