You have modified the following line in /etc/default/grub:
GRUB_CMDLINE_LINUX="acpi_backlight=vendor“
Note that you used back quotes at the end. They must be standard quotes.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1590243
Title:
package grub-efi-amd64 2.02~beta2-9ubuntu1.8 failed to
install/upgrade: 子进程 已安装 post-installation 脚本 返回了错误号 2
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