You have added the following invalid line to your /etc/default/grub file
and will need to remove it:
fffi:q# info -f grub -n 'Simple configuration'
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1529375
Title:
package grub-pc 2.02~beta2-29ubuntu0.2 failed to install/upgrade: 子程序
已安裝的 post-installation script 傳回了錯誤退出狀態 127
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