The error in the log is:

GRUB_CMDLINE_LINUX_DEFAULT: comando non trovato

This shows that /etc/default/grub has been locally modified to not be a
correct shell snippet.  This is not a bug in the grub package, but a
local configuration error.

** Changed in: grub (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1651884

Title:
  package linux-image-extra-4.4.0-53-generic 4.4.0-53.74 failed to
  install/upgrade: run-parts: /etc/kernel/postinst.d/zz-update-grub
  exited with return code 127

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