[Bug 1458549] Re: grub-efi-amd64 update fails missing quote

[ssducf]

Additionally, the grub tools don't care about the parse error and give
neither warnings nor errors.

Only the updater tool cares about the parse error, and it crashes
without an error message (just an exit value), when it could easily fix
the parse error.

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https://bugs.launchpad.net/bugs/1458549

Title:
  grub-efi-amd64 update fails missing quote

Status in grub2 package in Ubuntu:
  Invalid

Bug description:
  On running normal updates, grub-efi-amd64 failed even though update-
  grub and install-grub succeeded when run manually.

  After a bit of digging and googling, it turns out that
  /etc/default/grub was missing a quote on a line that the updates were
  trying to edit.

  
  Output generated:
    dpkg: error processing package grub-efi-amd64 (--configure):
     subprocess installed post-installation script returned error exit status 128

  
  Output expected:
    Either emit a useful error message so this can be fixed, or go ahead and add the quote missing from the line.

  Line at fault was:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash

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