[Bug 1553190] [NEW] describe configuration variables in /etc/default/grub in comments

[Karl-Philipp Richter]

Public bug reported:

Some configuration variables like `GRUB_DEFAULT` have a complex
structure (It can take a number or a string. What does the number mean
if submenues are involved? What names can be specified (`menuitem`
labels? How about non-disjoint submenu labels? `menu_option_id`s?). I'm
sure that it's documented somewhere, but that's unhelpful if it isn't at
least linked (better shortly summaried) at the place where it's needed.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: grub-efi 2.02~beta2-36
Uname: Linux 4.2.5-040205-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
Date: Fri Mar  4 14:13:36 2016
InstallationDate: Installed on 2015-04-20 (318 days ago)
InstallationMedia: Ubuntu-Server 14.10 "Utopic Unicorn" - Release amd64 (20141022.2)
ProcEnviron:
 TERM=screen.linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: grub2
UpgradeStatus: Upgraded to xenial on 2016-03-03 (0 days ago)

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1553190

Title:
  describe configuration variables in /etc/default/grub in comments

Status in grub2 package in Ubuntu:
  New

Bug description:
  Some configuration variables like `GRUB_DEFAULT` have a complex
  structure (It can take a number or a string. What does the number mean
  if submenues are involved? What names can be specified (`menuitem`
  labels? How about non-disjoint submenu labels? `menu_option_id`s?).
  I'm sure that it's documented somewhere, but that's unhelpful if it
  isn't at least linked (better shortly summaried) at the place where
  it's needed.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: grub-efi 2.02~beta2-36
  Uname: Linux 4.2.5-040205-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  Date: Fri Mar  4 14:13:36 2016
  InstallationDate: Installed on 2015-04-20 (318 days ago)
  InstallationMedia: Ubuntu-Server 14.10 "Utopic Unicorn" - Release amd64 (20141022.2)
  ProcEnviron:
   TERM=screen.linux
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2
  UpgradeStatus: Upgraded to xenial on 2016-03-03 (0 days ago)

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