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To remove guest login :
sudo sh -c ‘printf "[SeatDefaults]\nallow-guest=false\n" > /usr/share/lightdm/lightdm.conf.d/50-no-guest.conf‘
This will create a new file in /usr/share/lightdm/lightdm.conf.d
To get back guest login again remove 50-no-guest.conf
To remove remote login :
sudo sh -c ‘printf "[SeatDefaults]\ngreeter-show-remote-login=false\n" >/usr/share/lightdm/lightdm.conf.d/50-no-remote-login.conf‘
This will create a new file in /usr/share/lightdm/lightdm.conf.d
To get back remote login again remove 50-no-remote-login.conf
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原文地址：http://www.cnblogs.com/sxht/p/4720357.html
