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I have a Sony VAIO laptop and recently installed Ubuntu 12.04 along with win 7, dual boot! I have wifi which works on windows but on Ubuntu , my wireless is disconnected. I typed "rfkill list " on the terminal to check the reason for the problem and it shows me that my "acer-wireless:wireless LAN"is soft blocked and its not hard blocked. I tried clicking on the enable wireless option on the top left of the screen after logging into Ubuntu 12.04 but it is not getting enabled. Please help ,as I need to download eclipse for programming in college.

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Reset to default
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Please try:

sudo modprobe -r acer-wmi
sudo rfkill unblock all
rfkill list all

Now is your wireless working? If so, let's blacklist acer-wmi:

sudo su
echo "blacklist acer-wmi" >> /etc/modprobe.d/blacklist.conf
exit
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