install ssh service
sudo apt-get install ssh
edit config file
sudo vim /etc/ssh/sshd_config
change PermitRootLogin ‘s value into yes
restart ssh service
/etc/init.d/ssh restart
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![Run level](https://s2.loli.net/2022/05/24/8WFRQLAvPJekEim.png)
the meaning of each runlevel,switch run level, set default run level
2022-05-24
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![Set password for root](https://s2.loli.net/2022/05/22/pafAIkNwU35EhtQ.png)
Set password for root
2022-05-22