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ubuntu 右上角网络图标消失的问题解决
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解决的办法如下：
sudo service network-manager stop
sudo rm/var/lib/NetworkManager/NetworkManager.state
sudo service network-manager start
sudo gedit/etc/NetworkManager/nm-system-settings.conf把false改成true
sudo service network-manager restart
sudo service network-manager start
sudo gedit/etc/NetworkManager/nm-system-settings.conf把false改成true
sudo service network-manager restart
https://blog.sciencenet.cn/blog-645611-672287.html
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