[Bug 1517007] Re: package grub-pc 2.02~beta2-9ubuntu1.4 failed to install/upgrade: subprocess installed post-installation script returned error exit status 20

[Phillip Susi]

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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Title:
  package grub-pc 2.02~beta2-9ubuntu1.4 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 20

Status in grub2 package in Ubuntu:
  Invalid

Bug description:
  When i am updating ubuntu from terminal this error occures

  ProblemType: Package
  DistroRelease: Ubuntu 14.04
  Package: grub-pc 2.02~beta2-9ubuntu1.4
  ProcVersionSignature: Ubuntu 3.13.0-58.97-generic 3.13.11-ckt22
  Uname: Linux 3.13.0-58-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  Date: Tue Nov 17 16:57:43 2015
  DuplicateSignature: package:grub-pc:2.02~beta2-9ubuntu1.4:subprocess installed post-installation script returned error exit status 20
  ErrorMessage: subprocess installed post-installation script returned error exit status 20
  InstallationDate: Installed on 2014-10-22 (391 days ago)
  InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-58-generic root=UUID=2168d211-9deb-4320-81f3-b0d94192ee68 ro quiet splash acpi_backlight=vendor
  RelatedPackageVersions:
   dpkg 1.17.5ubuntu5.4
   apt  1.0.1ubuntu2.10
  SourcePackage: grub2
  Title: package grub-pc 2.02~beta2-9ubuntu1.4 failed to install/upgrade: subprocess installed post-installation script returned error exit status 20
  UpgradeStatus: Upgraded to trusty on 2015-04-18 (212 days ago)

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