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I have installed Ubuntu (12.04/12.10) as dual boot with windows 7 on Dell Inspiron 1545 laptop.
In Ubuntu's both version, network connection is not detected for wireless and Ethernet while on Windows OS, it is working fine.

I checked for bcm43 kernal drivers, those are also not default installed.
Any help is really appreciated.

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This answer worked for me, when I had wifi problems on a dell recently:

Please get a temporary wired ethernet connection and do:

sudo apt-get remove --purge bcmwl-kernel-source

sudo apt-get install linux-firmware-nonfree

Here is my question How do I get WiFi working on my Dell Inspiron 1501?

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