[Bug 581796] Re: grub-installer ignores grub2/linux_cmdline_default in preseed

[Jeremy]

I can confirm this issue persists in Focal as well. I've run into the
issue described at https://askubuntu.com/questions/1229910/ubuntu-20-04
-black-screen-after-installing-no-booting on Dell PowerEdge R640 series
with Matrox G200 graphics and in UEFI boot mode.

The suggested fix (remove quiet splash boot flags) works, and I've
attempted to preseed this using the following line:

grub-pc grub2/linux_cmdline_default string

This works for the first boot after installation, and I can confirm the
setting with debconf-get-selections.

Unfortunately /etc/default/grub still contains the quiet splash options,
so the next time update-grub is called (e.g. kernel update) the box will
fail to come up on boot unless that file is manually edited first.

Ideally the grub-pc grub2/linux_cmdline_default option would ensure that
/etc/default/grub is set correctly so there is no unexpected reboot
failure after a kernel update.

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https://bugs.launchpad.net/bugs/581796

Title:
  grub-installer ignores grub2/linux_cmdline_default in preseed

Status in grub-installer package in Ubuntu:
  Triaged

Bug description:
  Binary package hint: grub-installer

  Description:    Ubuntu 10.04
  Release:        10.04

  When automatically installing a system with a preseed file, grub-
  installer seems to ignore settings for grub2/linux_cmdline_default.

  I have tried the following two lines in my preseed file, but none of
  them worked:

  grub-pc grub2/linux_cmdline_default string
  d-i grub2/linux_cmdline_default string

  
  When running `debconf-get-selections` on the newly installed system, the output still contains:

  grub-pc grub2/linux_cmdline_default     string  quiet splash

  
  This seems to be an error (or at least an undocumented nuisance) of grub-installer ignoring the settings in the preseed file.

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