1. Enable root user login
1. Set root password
sudo passwd root
Set the root account password after verifying the current account password
2. Switch command line to root
su - root
3. Annotate the following file content
vim /etc/pam.d/gdm-autologin
#auth required pam_succeed_if.so user != root quiet_succes
vim /etc/pam.d/gdm-password
# auth required pam_succeed_if.so user != root quiet_success
4. After restarting the computer, you can log in with the root user
Two, configure remote login
1. Check the openssh-server service
2. Install ssh service: apt-get install openssh-server
3. Modify the ssh configuration file
vi /etc/ssh/sshd_config
Port 22 #Uncomment this line
LoginGraceTime 2m # uncomment this line
PermitRootLogin yes #Uncomment this line and change prohibit-password to yes
StrictModes yes # uncomment this line
MaxAuthTries 6 #Uncomment this line
MaxSessions 10 # uncomment this line
3. Start or restart the service
systemctl restart ssh
systemctl enable ssh
4. After the configuration is complete, you can use the tool for remote connection.