cloud image grub default override user defaults

[YKorman]

I've generated a cloud image using vmbuilder.
Then when using the VM, I've made changes to GRUB_CMDLINE_LINUX_DEFAULT variable in /etc/default/grub.
After running grub-mkconfig -o /boot/grub/grub.cfg, the new configuration didn't apply.
The reason is that /etc/default/grub.d/50-cloudimg-settings.cfg overrides the above mentioned variable.
I suggest changing the configuration of:
GRUB_CMDLINE_LINUX_DEFAULT="console=tty1 console=ttyS0"
to:
GRUB_CMDLINE_LINUX_DEFAULT+=" console=tty1 console=ttyS0"

Thanks,
much appreciated.

[YKorman (ykorman)]

My suggestion doesn't work because grub-mkconfig is ran with dash and not bash.

[YKorman (ykorman)]

The correct solution is to use the following:
GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT console=tty1 console=ttyS0"

[David A. Desrosiers (setuid)]

Just jumping in here to add that the provided suggestion by YKorman above, does not work.

The correct answer is to add the parameters you want to append, to `GRUB_CMDLINE_LINUX`, not `GRUB_CMDLINE_LINUX_DEFAULT`, and make sure you re-run `sudo update-grub` before rebooting.

Something like:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX="ipv6.disable=1"