Solve : lan conection?

1.	Solve : lan conection?
Answer» i have 4 pc's. two with UBUNTU os & onother two are installed win 7 ultimate. i am tried to connect lan SHARING through these FOUR pcs. ubuntu is connecting with win 7& win 7 connect with win 7. but win 7cant connect with ubuntu & ubuntu also unable to share or connect with other ubuntu . GIVE me solution for it.

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