To solve this issue you should make sure you have installed the right driver and also you should make sure you removed all the conflicting drivers. Because if there is any conflicting drivers installed it will not allow the kernel to load the right driver.

Packages to be intalled

bcmwl-kernel-source

bcmwl-modaliases

Packages that should not be installed or removed

b43-fwcutter

linux-backports-modules-karmic

linux-backports-modules-karmic-generic

actually no backports-modules need not be installed.

Problems solved

• detecting wireless connections, but not able to connect.
• Wireless not working
• wireless is enabled but doesnt work.

Rosario Linux, Ubuntu Dell, Ubuntu, Wireless