[ubuntu] Odd wireless problem with Ubuntu 10

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http://ubuntuforums.org – I have just installed a squeaky-clean new version of Ubuntu 10.04.1 on a fresh, empty hard drive. No adjustments have been done. I have a Livebox-1808 for my sins and the wireless adapter (Instantly detected) found the signal. Ubuntu would not connect directly (defaults to WAP I think) so I had to do a manual install (Activate pairing, enter WEP key). Very quick and no problems. It shows the connection at 100% and all seems to be functioning correctly but nothing else will use the connection. Firefox and Update seem unaware that there is a valid, working Internet connection (or is there?). (HowTos)