I believe this is fixed in curtin (per https://bugs.launchpad.net/curtin/+bug/1527664); as most recent reports are regarding server installs, my best guess is that subiquity is (or, probably, was) shipping an affected curtin version, so I'll leave it to that team to work out how to address that.
** Also affects: subiquity Importance: Undecided Status: New ** Changed in: curtin (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1569567 Title: Running update-grub does not update /boot/grub/grub.cfg with GRUB_CMDLINE_LINUX_DEFAULT from /etc/default/grub To manage notifications about this bug go to: https://bugs.launchpad.net/subiquity/+bug/1569567/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs