1.sudo gedit /etc/network/interfaces
2. 把里边的配置全部注销,保存退出。
#auto lo
#iface lo inet loopback
#auto dsl-provider
#iface dsl-provider inet ppp
#pre-up /sbin/ifconfig mac up # line maintained by pppoeconf
#provider dsl-provider
#auto mac
#iface mac inet manual
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