Unfortunately, it seems that the wireless device used in the Macbook Pro 4.1 has no linux driver yet. Ndiswrapper has to be used instead. After uncompressing the rar file named broadcomxpinstaller.exe, simply use the file bcmwl5.inf for a 64 bits installation even if broadcominstaller64.exe is also provided. I updated the Ubuntu wiki to precise it. Refer to the wiki for additionnal information.
https://wiki.ubuntu.com/MacBookPro/Penryn#Installing the Broadcom Wireless Driver