/etc/default/grub is ucf/debconf managed conffile, which has always been
processed by grub2 maintainer scripts, and there was no change in
behaviour of that in bionic.
You may not have ever noticed this before, because you might have only
applied the config change without re-running dpkg-reconfigure on the
relevant grub2 package, nor apply any updates that might be available.
Note that on all new installations / launches of new instances, all
updates are applied during installation process where possible. Thus
this is not a regression in updates.
Many of the options specified there are not used by Ubuntu initramfs-
tools and have no effect, why are you specifying dracut options? Have
you converted your system from initramfs-tools to dracut?
Did you experience that the syntax used in the conffig file ever worked
across grub2 upgrades or dpkg-reconfigure in any Ubuntu or Debian
release?
Note, that you can always use dpkg preseed of the debconf key with all
of the extra commandline options which will persist across grub2
updates; or use the .d drop in files (although those too, get parsed).
** Tags removed: regression-update
** Changed in: grub2 (Ubuntu)
Status: Triaged => Incomplete
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https://bugs.launchpad.net/bugs/1868138
Title:
18.04LTS upgrade of grub-common:amd64 FAILs in post-install;
incorrectly REWRITES user's /etc/default/grub
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