[Bug 1569567] Re: Running update-grub does not update /boot/grub/grub.cfg with GRUB_CMDLINE_LINUX_DEFAULT from /etc/default/grub

[Felix Bünemann]

I'm seeing this or a similar problem on ubuntu 18.04.1 server on an UEFI
system, were both GRUB_CMDLINE_LINUX_DEFAULT and
GRUB_CMDLINE_LINUX_EXTRA in /etc/default/grub are ignored (kernel flags
don't appear in /boot/grub/grub.cfg after running update-grub), but
specifying kernel flags in GRUB_CMDLINE_LINUX works.

The system also has a /etc/default/grub.d/50-curtin-settings.cfg file,
but according to dpkg -S no package owns that file and neither maas or
curtin packages are (or where) installed.

The system was installed onto bare metal from a bootable usb stick.

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https://bugs.launchpad.net/bugs/1569567

Title:
  Running update-grub does not update /boot/grub/grub.cfg with
  GRUB_CMDLINE_LINUX_DEFAULT from /etc/default/grub

Status in curtin package in Ubuntu:
  Confirmed
Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  Running update-grub does not update /boot/grub/grub.cfg with options
  from GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub

  Reproducer:
  1. edit GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub .
  2. Run update-grub
  3. check /boot/grub/grub.cfg for the correct options

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