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My laptop is Dell Inspiron 14R. My ethernet and wireless controllers are:

Atheros AR8162 Fast Ethernet [1969:1090] (rev 10)
Network Controller Broadcom BCM43142 802.11b/g/n [14e4:4365] (rev 01)

After reading from other posts I have downloaded compat-wireless-2012-02-28-p.tar.bz2 from another machine. But while doing make I have the following error

/home/rahul/Desktop/compat-wireless-2012-02-28-p/config.mk:242: "WARNING: CONFIG_CFG80211_WEXT will be deactivated or not working because kernel was compiled with CONFIG_WIRELESS_EXT=n. Tools using wext interface like iwconfig will not work. To activate it build your kernel e.g. with CONFIG_LIBIPW=m."  
./scripts/gen-compat-autoconf.sh .config config.mk > include/linux  /compat_autoconf.h  
make -C /home/rahul/Desktop/compat-wireless-2012-02-28-p modules  
make[1]: Entering directory `/home/rahul/Desktop/compat-wireless-2012-02-28-p'  
/home/rahul/Desktop/compat-wireless-2012-02-28-p/config.mk:242: "WARNING: CONFIG_CFG80211_WEXT will be deactivated or not working because kernel was compiled with CONFIG_WIRELESS_EXT=n. Tools using wext interface like iwconfig will not work. To activate it build your kernel e.g. with CONFIG_LIBIPW=m."    
make -C /lib/modules/3.5.0-17-generic/build M=/home/rahul/Desktop/compat-wireless-2012-02-28-p modules  
make: Entering an unknown directory  
make: *** /lib/modules/3.5.0-17-generic/build: No such file or directory.  Stop.  
make: Leaving an unknown directory  
make[1]: *** [modules] Error 2  
make[1]: Leaving directory `/home/rahul/Desktop/compat-wireless-2012-02-28-p'  
make: *** [.compat_autoconf_compat-wireless-2012-02-28-p] Error 2
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2 Answers 2

Before installing alien software, check for proprietary drivers. Go to System Settings and open Software Sources. Then go to the Additional Drivers tab and check if there is an additional driver you can use. Maybe you have as well to install bcmwl-kernel-source

enter image description here

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Since neither your wired, nor wirreless are working and therefore you don't have internet you may first download keryx, and use it download the necessary packages. Then follow this answer to solve wireless problem.

Then try this other answer for the ethernet card.

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