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When i was installing ubuntu Wifi worked without setting up anything. But once the installation is completed now I cannot connect to Wifi any more. The drop down says "not enabled" for the wifi option? How can I fix this?

here is what i get in " ifconfig -a" eth0 Link encap:Ethernet HWaddr 20:1a:06:c3:xx:xx lo Link encap:Local Loopback wwan0 Link encap:Ethernet HWaddr 0a:28:1a:75:aa:78

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Open a terminal with Ctrl+Alt+t and type the following commands:

rfkill unblock wifi
nmcli nm wifi on

It should re enable the Wifi interface.

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