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I installed my wireless driver bcm43142 but can't use it

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http://askubuntu.com – In Additional Drivers , it shows " Using Broadcom 802.11 Linux STA wireless driver source from wireless-bcm-43142-oneiric-dkms (open source) ". When I type iwconfig in terminal , it shows "iwconfig lo no wireless extensions. eth0 no wireless extensions. " Screenshot >> https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-ash4/486200_4752913934... (HowTos)