I've been searching for half an hour why an update-grub doesn't add my parameters from /etc/default/grub to the kernel command line...
> tail -6 /etc/default/grub.d/50_lmde.cfg
# grub-pc's postinst has some unwanted conffile management which removes
# /etc/default/grub, thus removing "quiet splash" from grub.
# Setting it here ensures we continue to have a splash, whether or not
# /etc/default/grub is present.
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