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Configurate root account

After having installed Ubuntu OS, you should update config file for root account. The commands are listed as follow:

 

vi /etc/lightdm/lightdm.conf #open config file and then add two commands as follow

greeter-show-manual-login=true # allow root account

allow-guest=false # disable guest account

 

Set password for root

 

sudo passwd root # set password for root