You appear to have copied /boot/grub/grub.cfg to /etc/default/grub. You
will need to delete this file and run apt-get install --reinstall grub-
pc to replace it with the original contents.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1510183
Title:
Upgrading to Ububtu 15.10. package grub-pc 2.02~beta2-29 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 127
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