I'm aware this has been asked before, but nothing in those replies helped me.
I'm using Lubuntu and up to a couple of hours ago everything worked fine (i.e. wifi was up an running). A weird problem though has since emerged. My wlan interface can see all nearby networks but can't connect to any of them. I have confirmed (with other computers) that the network is working properly.
I connected the computer using a lan cable and installed wicd, without any luck. I still see all the nearby networks, but trying to connect to my private network it first says "putting interface up", "validating authentication", then quits by reporting "not connected". Trying to connect to another, unprotected network, i get up to "obtaining ip address", then it quits without connecting.
"rfkill list" says wirelass is hard blocked (earlier it was neither soft- nor hard blocked). sudo rfkill unblock all does nothing.
I've tried to connect using another OS (booting a fresh puppy from usb) and it couldn't connect either, reporting: "ifconfig siocsifflags operation not possible due to rf-kill"
Do I have a hardware problem? Because I'm inclined to believe that's the case, if I'm having issues using a live usb...