[Bug 1814403] Re: Latest update causes 30 sec. menu delay timeout

[Steve Langasek]

Also,

> using EFI+btrfs boot volume. No LVM used, just GPT on NVMe.

Yes, this change was introduced to address the problem as seen on LVM-
backed /boot/grub, but that is certainly not the only configuration for
which GRUB has read support but lacks write support.  The fix is generic
to all such filesystems that are read-only in GRUB, and that is by
design.

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https://bugs.launchpad.net/bugs/1814403

Title:
  Latest update causes 30 sec. menu delay timeout

Status in grub2 package in Ubuntu:
  Won't Fix

Bug description:
  KDEneon LTS user edition 5.12, Release 18.04

  grub-common 2.02-2ubuntu8.10 from Ubuntu updates

  Since latest update near the end of Jan. 2019 (29th?), grub menu has
  30 second delay every reboot as though recordfail is set. It did not
  do this before the update.

  After messing with grubenv and recordfails settings, I found this
  paragraph in 00_header in 18.04 that is not in 16.04:

  if lsefi; then
    set timeout=30 
    if [ x$feature_timeout_style = xy ] ; then
      set timeout_style=menu
    fi
  fi

  Note "timeout=30" which is the same as the recordfail timeout. As a
  test, I edited /boot/grub/grub.cfg and changed the 30 to 17 and sure
  enough, that's the source of the timeout.

  Here's the paragraph from 00_header:

  if lsefi; then  set timeout=${GRUB_RECORDFAIL_TIMEOUT:-30}
    if [ x\$feature_timeout_style = xy ] ; then
      set timeout_style=menu
    fi
  fi

  One odd thing is the 00_header file is from Jan 9th but this bug has
  just appeared so it must be related to grub-common not the the header
  file.

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