Good day, for some strange reason, ubuntu 14.04 lost the ability to connect to w-fi, from the panel where you used to choose wi-fi - the option just disappeared. someone can tell what the problem is and whether it is possible to solve it. Before that, everything worked fine, Ubuntu downloaded updates, maybe after that the function disappeared 
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ifconfig -aandcat /etc/network/interfacesto the studio. - don Rumata