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sudo gedit /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf
greeter-show-manual-login=true
1. 修改 root 密码
sudo passwd root
2. 以其他账户登录,通过 sudo nano 修改 /etc/ssh/sshd_config :
xxx@ubuntu14:~$ su - root Password: root@ubuntu14:~# vi /etc/ssh/sshd_config
3. 注释掉 #PermitRootLogin without-password,添加 PermitRootLogin ye
# Authentication: LoginGraceTime 120 #PermitRootLogin without-password PermitRootLogin yes StrictModes yes
4. 重启 ssh 服务
root@ubuntu14:~# sudo service ssh restart ssh stop/waiting ssh start/running, process 1499 root@ubuntu14:~#
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原文地址:http://www.cnblogs.com/banwhui/p/4721609.html