You have added two incorrect lines to the end of /etc/default/grub: you
need to set those options in the existing line which is terminated with
an end quote.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1539177
Title:
package grub-pc 2.02~beta2-9ubuntu1.7 failed to install/upgrade:
subprocess installed post-instal
