diff --git a/Linux_reinstall/Ubuntu/CloudInit/ipv4_static_interfaces.cfg b/Linux_reinstall/Ubuntu/CloudInit/ipv4_static_interfaces.cfg
index 7882941..30ddd70 100644
--- a/Linux_reinstall/Ubuntu/CloudInit/ipv4_static_interfaces.cfg
+++ b/Linux_reinstall/Ubuntu/CloudInit/ipv4_static_interfaces.cfg
@@ -64,19 +64,21 @@ network:
 # Enable sshd service.
 # Reload systemd.
 # Make sshd service loading automatically at the next reboot.
-# Restart the sshd service.
+# Kill the original sshd service so that to liberate the occupation of "0.0.0.0:22" and "[::]:22" to avoid "error: Bind to port sth on sth failed: Address already in use." causes restarting and applying new configs failure of the sshd service.
+# Restart sshd service.
 # Disable kernel need to restart: https://askubuntu.com/questions/1349884/how-to-disable-pending-kernel-upgrade-message
 # Install some common components.
 # Configure vim for more convenient to use.
 # Rename netplan config file.
-# Configure fail2ban.
+# Configure and restart fail2ban.
 # Update grub.
 # Delete cloud-init config file itself and disable it permanently after first execution.
 runcmd:
-  - systemctl disable --now ssh.socket
-  - systemctl enable --now ssh.service
+  - systemctl disable ssh.socket
+  - systemctl enable ssh.service
   - systemctl daemon-reload
   - update-rc.d ssh enable
+  - kill -9 $(ps -ef | grep '/usr/sbin/sshd' | gawk '$0 !~/grep/ {print $2}' | tr -s '\n' ' ')
   - /etc/init.d/ssh restart
   - sed -i 's/#$nrconf{restart} = '"'"'i'"'"';/$nrconf{restart} = '"'"'a'"'"';/g' /etc/needrestart/needrestart.conf
   - sed -i "s/#\$nrconf{kernelhints} = -1;/\$nrconf{kernelhints} = -1;/g" /etc/needrestart/needrestart.conf