My standard answer for a post like your first post is
You have to tell us more facts.
The minimum is exactly which Mint you have - which version and which edition
(main or any of the CEs)
We also need to know a bit about all your hardware.
Run " lspci " in a terminal and post here (to avoid misunderstanding - the first character is a minor L and you copy by marking with the mouse and then right click)
Some wifi and possibly built in sound can be connected to USB even if they are internal - if you suspect you have one of these run " lsusb " in a terminal.
Also tell us if this is using mint4win or not, quite important
Forget about the changes to sources.list above - change it to the default - not part of the solution
Now we've already got lscpi and lsusb and there I see that you have a bcm 4306
The Broadcom chips are a pain but it has been much easier to use them.
There are two options and one or both should work
Connect with a wired connection and open Hardware drivers in the menu - you should see an option for bcm4306 (or similar - should say something with Broadcom, bcm and/or 4306) - activate it and soon your wifi works
If you don't see the option or it don't work for you follow this how tohttps://help.ubuntu.com/community/WifiD ... y_No-Fluff
It works for Intrepid/Felicia even if it says Feisty in the title and ndiswrapper (Windows wireless drivers) is already installed
So you don't do this
sudo apt-get install ndiswrapper-utils-1.9
mkdir ~/bcm43xx; cd ~/bcm43xx
This is a long post and it was a while since I followed it to install my own 4312 so I may have missed some difficulty
Don't hesitate to ask for more help, but I really think the Hardware drivers should do it