Your /etc/default/grub file is corrupt. When setting variables, the
value must begin and end with quotes, but your last two lines have a
begin quote, but no end quote.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1517007
Title:
package grub-pc 2.02~beta2-9ubuntu1.4 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 20
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