He was going by Gustav on the 1940 Federal Census and was married to Margit. He listed his occupation as chemist in a factory and address matches that which you found on his naturalization.
:
NAME: Gustav Anderson
AGE: 36
ESTIMATED BIRTH YEAR: abt 1904
GENDER: Male
RACE: White
BIRTHPLACE: Sweden
MARITAL STATUS: Married
RELATION TO HEAD OF HOUSE: Head
HOME IN 1940: New York, New York, New York
MAP OF HOME IN 1940: View Map
STREET: 65th Street
FARM: No
INFERRED RESIDENCE IN 1935: New York, New York, New York
RESIDENCE IN 1935: Same Place
CITIZENSHIP: Naturalized
SHEET NUMBER: 4B
NUMBER OF HOUSEHOLD IN ORDER OF VISITATION: 163
OCCUPATION: Chemist
HOUSE OWNED OR RENTED: Rented
VALUE OF HOME OR MONTHLY RENTAL IF RENTED: 32
ATTENDED SCHOOL OR COLLEGE: No
HIGHEST GRADE COMPLETED: Elementary school, 8th grade
HOURS WORKED WEEK PRIOR TO CENSUS: 40
CLASS OF WORKER: Wage or salary worker in private work
WEEKS WORKED IN 1939: 52
INCOME: 1000
INCOME OTHER SOURCES: No
NEIGHBORS: View others on page
HOUSEHOLD MEMBERS:
NAME AGE
Gustav Anderson 36
Margit Anderson 31

===========================

Margit was also naturalized; address the same again.

NAME: Margit Anderson
BIRTH DATE: abt 1908
AGE: 39
NATURALIZATION DATE: 13 Nov 1947
RESIDENCE: New York, New York
TITLE AND LOCATION OF COURT: New York Southern District

Not sure if you have the naturalization index card found on Ancestry, or the actual naturalization papers for Linne, but the papers themselves would provide more information. Did not find a marriage or obit; perhaps some other poster will. Email me at pat4gen@hotmail.com if you would like scans of what I found.