No valid PGP data found

Sorry I was unable to find a suitable forum to place my query, but I am trying to verify the .asc file on terminal with no luck . the error I received is “no valid PGP data found” , how do I sort this out ?

Do you know how to OpenPGP verify software signatures generally? If not, please learn as per https://www.kicksecure.com//wiki/Free_Support_Principle