For me it was because my ubuntu was binding the hostname to IPv6 address, if you continue to face problems, the below article is worth a shot.
http://telsonalva.blogspot.in/2016/07/how-to-access-samba-share-in-linux-by.html
this worked for me
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Answer by Telson Alva for How can I connect to a Samba server using its hostname instead of the IP?
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