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I disabled bluetooth from bluetooth tray menu (unity), then bluetooth was disabled, and wireless disabled too. I can't enable bluetooth and wireless again. It said:

bluetooth is disabled by hardware switch
wireless is disabled by hardware switch

I checked BIOS, no bluetooth, wireless option.

FN+F2 doesn't work.

sudo rfkill unblock all doesn't work.

sudo rfkill list:

0: dell-wifi: Wireless LAN
   Soft blocked: yes
   Hard blocked: yes
1: dell-bluetooth: Bluetooth
    Soft blocked: yes
    Hard blocked: yes
2: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: yes
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Do you have a switch on the case of your laptop you flipped? –  Seth Jan 19 '13 at 3:46
    
Try Fn+Alt+F2 as per askubuntu.com/a/176898/53508 –  Sparhawk Jan 19 '13 at 3:53
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