Comment 163 for bug 193970

Workaround for Acer Notebook user

to enable the wireless by configuring the file /etc/modprobe.d/options

Please follow this procedure:

Step 1: Open Terminal from "Applications->Accessories->
Terminal"

Step 2: Run the following command (copy-paste the line below to the
Terminal then hit <enter>)

Code:

sudo gedit /etc/modprobe.d/options

# add the following 2 lines to the end of the options file

Code:

options iwl3945 disable=0
options acer-wmi wireless=1

Step 3: Reboot pc and then retest the wireless

credit for this solution goes to Mark Rijckenberg , from this thread> https://answers.launchpad.net/ubuntu/+source/util-linux/+question/61864