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I've been using Ubuntu for about a month now, with a Broadcom-chipped wifi card and a 3com wireless router. I managed to use Ndiswrapper to get a wireless network connection working perfectly, and everything ran fine.
My problem is that Ubuntu has suddenly failed to connect to the internet - it pauses for ages on boot up when trying to set up the network connections, and when it finally boots there is no connection. Typing 'iwlist wlan0 scan' just returns something like 'no networks found'.
The thing is it all works fine in XP still, so as far as I can see there's nothing wrong with the router. I've tried restarting the router but that doesn't help.
I had this problem too a few weeks ago, and the only way I could get it all working again was to reset the router, but this is a pain as it involves setting everything on it up again. I thought it was a one off but now that it's happened again I'm quite concerned because I don't want to have to reset the router every week or so when Ubuntu can't see it!
Has anyone got any ideas why XP should carry on working fine while Ubuntu just suddenly won't see my router? Any help would be appreciated!