If not explicitly configured, let's search a bit harder for the ENTRY_TOKEN, and let's try the machine ID, the IMAGE_ID and ID fields of /etc/os-release and finally "Default", all below potential $XBOOTLDR.
If not explicitly configured, let's search a bit harder for the ENTRY_TOKEN, and let's try the machine ID, the IMAGE_ID and ID fields of /etc/os-release and finally "Default", all below potential $XBOOTLDR.