[Bug 1258597] Re: [Patch] Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.

[Łukasz Zemczak]

Installed a clean bionic install, made sure grub2 binaries are at
version 2.02-2ubuntu8.1, running `sudo update-grub` resulted in printing
out the Warning: message. Then upgraded all grub2 binaries to
2.02-2ubuntu8.2 from bionic-proposed, re-ran the command and confirmed
no message is visible.

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Title:
  [Patch] Setting GRUB_TIMEOUT to a non-zero value when
  GRUB_HIDDEN_TIMEOUT is set is no longer supported.

Status in grub2 package in Ubuntu:
  Fix Committed
Status in grub2-signed package in Ubuntu:
  Fix Committed
Status in grub2 source package in Trusty:
  Triaged
Status in grub2-signed source package in Trusty:
  New
Status in grub2 source package in Bionic:
  Fix Committed

Bug description:
  [Impact]
  All Ubuntu users.

  [Test case]
  Run 'sudo update-grub'. The message is shown at the beginning.

  [Regression potential]
  There is a low risk of regression given that this change is essentially a no-op; changing two environment variables that are deprecated (and have been for a long while, pre-xenial), with a single, less confusing equivalent. That said, changes to the default config options may adversely impact boot behavior for systems. Systems could start to always show the grub menu, or it may become hard to reach the menu when it was otherwise reachable due to the changes in timeout behavior. Any changes to the behavior of the boot menu timeout / default grub options should be looked at with suspicion.

  ---

  When running update-grub I am getting the following message:

  Warning: Setting GRUB_TIMEOUT to a non-zero value when
  GRUB_HIDDEN_TIMEOUT is set is no longer supported.

  $ sudo update-grub
  Generowanie grub.cfg...
  Uwaga: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
  Znaleziono obraz Linuksa: /boot/vmlinuz-3.12.0-6-generic
  Znaleziono obraz initrd: /boot/initrd.img-3.12.0-6-generic
  Found memtest86+ image: /boot/memtest86+.elf
  gotowe

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: grub2 (not installed)
  ProcVersionSignature: Ubuntu 3.12.0-6.14-generic 3.12.3
  Uname: Linux 3.12.0-6-generic x86_64
  ApportVersion: 2.12.7-0ubuntu1
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Fri Dec  6 18:49:28 2013
  InstallationDate: Installed on 2013-10-15 (51 days ago)
  InstallationMedia: Ubuntu-GNOME 13.10 "Saucy Salamander" - Release amd64 (20131015)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=pl_PL.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2
  UpgradeStatus: Upgraded to trusty on 2013-11-05 (31 days ago)

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