[ubuntu] help(network problem)

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http://ubuntuforums.org – welcome dears i have upgraded to 9.10 after restart i discoverd that internet did not respond i noticed that network sign is (X) then i done new connection but not responding also the status which exist (never word) and the mac addrese plase is empty if i tryied to write it not satisfy i noticed also the interface card is on please if any one know this problem help me thanks advance (HowTos)