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Installed 12.04 on dell inspiron 5420. wired connection is working however wifi and bluetooth connection does not work. In fact I can't see wlan0. Can I know the correct driver to install?

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You could start by typing 'lspci' in a terminal to know which Broadcom card you have. – To Do Sep 9 '12 at 8:59
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Take a look at this: askubuntu.com/questions/127633/… – To Do Sep 9 '12 at 9:01
result of lspci 02:00.0 Network controller: Broadcom Corporation Device 4365 (rev 01) – ADARSH MJ Sep 9 '12 at 15:43
is it solved? did you look at the link? – green7 Sep 9 '12 at 15:54
i tried but the acces was denied.. – ADARSH MJ Sep 9 '12 at 15:55
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2 Answers

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it's the driver issue, the broadcom didn't release the driver source. some guy extracted a amd64 binary version from Dell's pre-loaded Ubuntu. follow this link to see more. https://bbs.archlinux.org/viewtopic.php?id=145884

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ubuntu-1204-wifi-not-working-at-laptop-or-notebook-unblock-it

Ubuntu 12.04. WiFi not working

Check if the wifi card is blocked (Terminal)

rfkill list wlan (for wifi)

OR

rfkill list all (for wifi and bluetooth)

UNBLOCK:

rfkill unblock wlan (for wifi)

OR

rfkill unblock all (for wifi and bluetooth)

Restart the network:

sudo service network-manager restart
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