[ubuntu] Some networking problems

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http://ubuntuforums.org – I have two problems ... I am connected to the internet with a Rogers Rocket Stick, when I want to check my mail in Evolution the "send and receive" tab is not highlighted. It was working yesterday when I was connected through wireless why is that and how do I fix it ? I installed Ubunto remix on a Netbook but I can not connect my Laptop with ubuntu to my Netbook with ubuntu, both these computers are connected on the network, it asked for the password to be able to connect on both computers but I cant get the two to communicate with each other .... yesterday when I still had windows xp on my Netbook I had no problem connecting the two computers ... (HowTos)