You can try reintsalling the firmware for the brcm adapter then rebooting. The Linux kernel is not the problem. The wifi is blocked by an on/off mechanical switch.The problem is the Dell BIOS which are accessible to the Apple Iphone and the laptop era Vista/XP. Check the BIOS to make sure the hardware WIFI switch is enabled, and by the way first try turning it off and on again. Also change the boot order if USB is listed ahead of main disk and/or disallow booting or flashing from USB.
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All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.