WiFi Dell L120 Broadcom 4318 Problems

[Dekatron]

I've noted from other posts that installation of Broadcom wifi driver can be a problem. I have tried to follow the other posts to no avail.
I've installed Mint 17.1 on a Dell Latitude L120 which works fine except the wifi. When viewing device manager following is displayed "Broadcom Corporation: Wireless 1370 WLAN Mini-PCI Card this device is using an alternative driver.
Question is do I need to remove this alternative driver before installing the correct one?
I have tried this and the usually it takes out the wired network driver and then I have to re-start the laptop to regain the connection.
Running "sudo apt-get purge bcnwl-kernel-source" gives a response of "dpkg was interrupted, you must run manually run 'sud0 dpkg --configure -a' to correct the problem.", Running this end up with ".... DKMS: installation completed. Segmentation fault" and the wired network connection drops out.
Any ideas?

[JeremyB]

Try running

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sudo apt-get purge bcmwl-kernel-source

again and there is another method, post

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ls /etc/modprobe.d/

as the bcmwl package blacklists the needed modules and I don't remember the exact name