Comment 0 for bug 1906379

When MAAS deploys CentOS 7/8 it boots into the user selected commissioning environment(Xenial, Bionic, or Focal) and runs Curtin. If the system uses UEFI Curtin creates a boot entry with efibootmgr. Adding and ordering the entry is logged and I have manually confirmed it is created properly. Once Ubuntu shuts down to boot into the deployed system it seems to be removing CentOS's UEFI boot entry. I have confirmed this happens during the shutdown process by using the system firmware to select a temporary boot device(Ubuntu LiveCD) and running efibootmgr -v to see only the system default boot entries.

This can cause booting failures when network booting isn't available or a grub bug such as LP:1906344.