I'm seeing this or a similar problem on ubuntu 18.04.1 server on an UEFI system, were both GRUB_CMDLINE_LINUX_DEFAULT and GRUB_CMDLINE_LINUX_EXTRA in /etc/default/grub are ignored (kernel flags don't appear in /boot/grub/grub.cfg after running update-grub), but specifying kernel flags in GRUB_CMDLINE_LINUX works.
The system also has a /etc/default/grub.d/50-curtin-settings.cfg file, but according to dpkg -S no package owns that file and neither maas or curtin packages are (or where) installed.
The system was installed onto bare metal from a bootable usb stick.
I'm seeing this or a similar problem on ubuntu 18.04.1 server on an UEFI system, were both GRUB_CMDLINE_ LINUX_DEFAULT and GRUB_CMDLINE_ LINUX_EXTRA in /etc/default/grub are ignored (kernel flags don't appear in /boot/grub/grub.cfg after running update-grub), but specifying kernel flags in GRUB_CMDLINE_LINUX works.
The system also has a /etc/default/ grub.d/ 50-curtin- settings. cfg file, but according to dpkg -S no package owns that file and neither maas or curtin packages are (or where) installed.
The system was installed onto bare metal from a bootable usb stick.