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Q: On my ubuntu 14.04 machine, when I connect to a wired network, the network manager constantly tries to connect to the wireless network and pops up "network unavailable" despite the fact that I have disabled the wireless network by "ifconfig wlan0 down"
A: Do not check the "require ipv6 addressing" box!
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原文地址：http://www.cnblogs.com/ch3cooh/p/ubuntu_trouble.html
