[Bug 1273764] Re: Grub ignores TIMEOUT options on /etc/default/grub

[pelm]

A week ago I upgraded to a new grub2 on Ubuntu 20.04 and thought it was
fixed. It wasn't. Every now and then grub menu is showing on boot which
it shouldn.t. Why? My /etc/default/grub is this:

GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

Haven't changed anything, I did a fresh install of 20.04, when I was
upgrading from 18.04. No other os on computer. Thanks in advance for
investigating this.

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https://bugs.launchpad.net/bugs/1273764

Title:
  Grub ignores TIMEOUT options on /etc/default/grub

Status in grub2 package in Ubuntu:
  Triaged
Status in grub2 source package in Vivid:
  Triaged

Bug description:
  This is a fresh install of trusty (amd64), without proposed (since
  this grub package has reached the regular repos).

  I have attached my `/etc/default/grub` file. After modifying it, I
  make sure to run update-grub, but the changes won't take effect on
  next reboot: the menu is shown with a timeout of 10 seconds even when
  GRUB_TIMEOUT_STYLE is set to countdown.

  After reading grub.cfg and googling a bit I found this:

  https://gist.github.com/LeahCim/9332432

  (30_os-prober is overriding the values of GRUB_TIMEOUT and
  GRUB_TIMEOUT_STYLE.)

  Description:	Ubuntu Trusty Tahr (development branch)
  Release:	14.04

  grub-pc:
    Installed: 2.02~beta2-7
    Candidate: 2.02~beta2-7
    Version table:
   *** 2.02~beta2-7 0
          500 http://do.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

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