Bug#1107685: grub-efi-amd64: "GRUB_CMDLINE_LINUX_DEFAULT="quiet" incorrectly added to /etc/default/grub during upgrade

[Pascal Hambourg]

On 12/06/2025 at 08:43, Felix Zielcke wrote:
> 
> The problem seems to be that you have set in debconf
> grub2/linux_cmdline_default: quiet

The debconf value is supposed to be updated from /etc/default/grub.
I suspect that the line should not be commented out. If you want to 
remove "quiet" from the kernel command line, just set

GRUB_CMDLINE_LINUX_DEFAULT=""