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

[Taddy]

no more detailed information available

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: grub-efi-amd64 2.02~beta2-9ubuntu1.8
ProcVersionSignature: Ubuntu 3.13.0-68.111-generic 3.13.11-ckt27
Uname: Linux 3.13.0-68-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
Date: Wed Jun 8 11:50:19 2016
DuplicateSignature: package:grub-efi-amd64:2.02~beta2-9ubuntu1.8:子进程 已安装 post-installation 脚本 返回了错误号 2
ErrorMessage: 子进程 已安装 post-installation 脚本 返回了错误号 2
InstallationDate: Installed on 2015-11-11 (209 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
InvalidGrubScript: /etc/default/grub
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-68-generic.efi.signed root=UUID=2b02b726-a81b-487a-947a-97011e800cb5 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.6
 apt 1.0.1ubuntu2.14
SourcePackage: grub2
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
UpgradeStatus: No upgrade log present (probably fresh install)

[Phillip Susi (psusi)]

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.