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Other questions in this vein have not really addressed the issue or were so technical that I didn't know if they addressed the issue or not. Here is the problem: my WiFi was connecting just fine until last update (can't tell you which one because I am using Windows to send this). Now it is hit and miss. Sometimes it connects right up and other times never after repeated attempts. Seems to center on rejected password for WPA. My system is dual boot, so the Wndows7 connects just fine. I try using earlier versions of Ubuntu from the GRUB selection on boot, but it doesn't seem to make any difference. I have uninstalled and reinstalled the Gnome Network Manager and Wicd. With no effect. I can do simple command line operations but get totally lost and frustrated with elaborate and uber-technical fixes.

By way of editorial comment, I have had this issue with Mint, SUSE and now Ubuntu. Seems to be a real weakness in Linux distros. Otherwise I absolutely love Ubuntu.

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try this:

sudo apt-get install linux-headers-generic

sudo apt-get install --reinstall bcmwl-kernel-source

sudo modprobe wl

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Try this: With my netbook it happens that wifi can't be found after start-up. I shut the lid of the netbook and wait a few seconds till it goes to sleep. Then I open the lid again, press any key (e.g. space) and the wifi kicks in almost directly. It also works using the the "sleep" key (Fn F4 on my netbook, acer d270)).

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You could just add a server manually. Click on the internet icon in the top right corner and on the bottom it will say "edit connections". Click on that and then under wireless hit "add". Put in your server's name and password and try connecting to it from there. If this doesn't work maybe try restarting your router manually?

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