Okay, I'm fairly new to this stuff, but my wife has a Compaq Mini that uses the Ubuntu 10.04 LTS operating system. It is connect via wifi to a Linksys E900 router. It says it is connected, but Firefox 15.0.1 (Mozilla Firefox for ubuntu canonical - 1.0) can't access the net, saying server not found. I have it set to "Auto-detect proxy settings for this network", though I've tried the no proxy setting as well. The network proxy preferences are set to direct internet connection (under system > preferences > network proxy) and the network setting for the connection as in Ad-hoc mode, using a WEP 128-bit passphrase for security. I thought I made a stupid mistake in the above settings (and still might have), but I have another wrinkle. I've tried using Update Manager, and tell it to check for updates manually. This never caused a problem before, but it "could not download all repository indexes". It says there are network problems (though it says the network connection is active 100%). It has many listed mistakes that use this format (the first of the errors):

Failed to fetch http://us.archive.ubuntu.com/ubuntu/...id/Release.gpg Something wicked happened resolving 'us.archive.ubuntu.com:http' (-5 - No address associated with hostname)

Can someone tell me what the heck I'm doing (wrong)? I'm staying on this page, updating often, just so I can get this taken care of and get my wife off my back Thank you for your time...