How to upgrade from Ubuntu Linux 16.04 to 18.04

Type the apt command or apt-get command to upgrade existing system: sudo apt update sudo apt upgrade Reboot the Linux box if kernel was updated sudo reboot If you have a ufw firewall running on ufw, open ssh port 1022 using the following ufw syntax: sudo ufw allow 1022/tcp comment 'Temp open port ssh tcp port 1022 for upgrade' Upgrade the operating system to the latest release from the command-line by typing the following command: sudo do-release-upgrade After some time you will see “System upgrade is complete” message. Press y to restart your system to load updates kernel and operating system for your cloud server: Verification Login using the ssh command: ssh user@your-ubuntu-server Verify Ubuntu Linux kernel version with uname: uname -r Make sure all needed ports are open and running with the ss command or netstat command: sudo ss -tulpn sudo netstat -tulpn Use grep command/egrep command or tail command/cat command to verify log files for errors: dmesg