+# HYBRID_METHOD='isohybrid' # use isohybrid from SYSLINUX
+# HYBRID_METHOD='grub2' # use manifold with GRUB 2
+# HYBRID_METHOD='manifold' # use manifold with ISOLINUX (default)
+
+# By default Secure Boot is enabled using the approach from Ubuntu.
+# Currently only the Ubuntu approach is supported, which is restricted
+# to loading Linux kernels and using a minimal version of GRUB.
+# If unset defaults to "ubuntu"
+# SECURE_BOOT='disable' # do not enable Secure Boot
+# SECURE_BOOT="ubuntu" # use approach from Ubuntu
+
+# Binary that should be used for creating the squashfs file.
+# Defaults to the executable matching the kernel version, falls back to mksquashfs.
+# SQUASHFS_BINARY='mksquashfs'
+
+# Options that should be used by mksquashfs during build process.
+# Defaults to '-b 256k' and the according LZMA/XZ option.
+# SQUASHFS_OPTIONS='-b 256k'