Apex domains cannot have CNAME records.
Question and response
Question
dig lineamarmi.net. NS
Answer
lineamarmi.net. 5 NS ns-1802.awsdns-33.co.uk.
lineamarmi.net. 5 NS ns-80.awsdns-10.com.
lineamarmi.net. 5 NS ns-710.awsdns-24.net.
lineamarmi.net. 5 NS ns-1348.awsdns-40.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0