Linux Tactic

Upgrade Your Ubuntu Server Safely and Securely: A Comprehensive Guide

Upgrading Ubuntu Server Version from 18.04 to 20.04 LTS

If you are an Ubuntu server user, it is important to keep your operating system up-to-date. A new version of Ubuntu is released every six months, but the Long-Term Support (LTS) version is typically released every two years.

The LTS version is recommended for enterprise and production environments because it receives updates for five years, whereas the non-LTS version only receives updates for nine months. This article will guide you through the process of upgrading your Ubuntu server from version 18.04 to 20.04 LTS.

Pre-upgrade Considerations

Before upgrading your Ubuntu server, you should take some pre-upgrade considerations to ensure a smooth process. The first consideration is downtime.

If you are running critical applications or services, you should plan for some downtime during the upgrade process. Another consideration is backup.

You should backup all your data and configurations before proceeding with the upgrade process.

Updating the System

The first step to upgrading your Ubuntu server is to update the current system. You should run the following command to update the system:

sudo apt update && sudo apt upgrade

This command updates the package management database and installs the latest available updates for your current Ubuntu version.

Configuring Update Manager

After updating the system, you should configure the Update Manager to check for the latest LTS version. You can do this by running the following command:

sudo nano /etc/update-manager/release-upgrades

Find the line that says “Prompt=lts” and change it to “Prompt=normal”.

Save the file and exit the editor. This change tells the Update Manager to check for the non-LTS version of Ubuntu.

Upgrading the Server

Once you have updated the system and configured the Update Manager, you can proceed with the upgrade process. You should run the following command to upgrade your Ubuntu server:

sudo do-release-upgrade

This command starts the upgrade process and prompts you with some questions. You should carefully read the questions and select the appropriate answers.

After answering all the questions, the upgrade process will begin.

SSH Connection

If you are upgrading your Ubuntu server through an SSH connection, you should ensure that your connection is stable and secure. You could potentially lose your connection during the upgrade process, which could cause some problems.

You should also ensure that you have a backup connection in case of any network problems.

Checking for a New Ubuntu Release

If you are not ready to upgrade to the latest Ubuntu version, you can always check for a new release without performing an upgrade. You can do this by running the following command:

sudo do-release-upgrade -c

This command checks for any new development or LTS releases of Ubuntu. If a new release is available, you will be prompted with some information, including the version number and release name.

Finding Ubuntu Version

If you want to know the current version of Ubuntu running on your server, you can run the following command:

lsb_release -a

This command displays detailed information about the current Ubuntu version, including the codename, release number, and description.

Conclusion

Upgrading your Ubuntu server is an essential process that ensures your system is secure and up-to-date. Taking pre-upgrade considerations, updating the system, configuring the Update Manager, and performing the upgrade process are crucial steps that you should follow.

Similarly, if you are not ready to upgrade but want to check for a new Ubuntu release, you can use the command line to check for any available updates. Knowing your Ubuntu version can help you keep track of important security updates and bug fixes.

By following the process outlined in this article, you can effectively upgrade your Ubuntu server to the latest LTS version with ease. Upgrading Ubuntu Server Over

SSH Connection

Upgrading your Ubuntu server over an SSH connection can be a convenient option, especially if your server does not have a graphical interface or you cannot physically access the server.

However, performing an upgrade over an SSH connection can be risky if you do not take the necessary precautions. This article will guide you through the steps to upgrade your Ubuntu server over an SSH connection safely.

Warning Message for

SSH Connection

Before you start the upgrade process, it is important to understand the risks associated with upgrading a server over an SSH connection. If your SSH connection fails during the upgrade process, it could result in the failure of the upgrade, leaving your server in an unusable state.

Therefore, it is recommended that you perform a backup of your server before starting the upgrade process.

Opening a New SSH Session

To start the upgrade process over an SSH connection, you need to open a new SSH session. By default, SSH uses a well-known port 22.

However, it is recommended that you use a custom SSH port, such as 1022, to improve security. You can also configure your firewall to allow only trusted IPs to connect to your server on this port.

Once you have opened a new SSH session, you can start the upgrade process by running the following command:

sudo do-release-upgrade

This command will prompt you with some questions, such as “do you want to continue” and “do you want to remove obsolete packages.” You should answer these questions carefully to avoid any issues during the upgrade process.

Recovering the Session

In case your SSH connection fails during the upgrade process, you can use the screen command to recover your session. Screen is a terminal multiplexer that allows multiple terminal sessions to be accessed from a single SSH session.

To use screen, you can run the following command:

screen -R

This command will reconnect you to your previous session. You can then continue with the upgrade process by running the same command as before:

sudo do-release-upgrade

Post-Upgrade Verification

After upgrading your Ubuntu server over an SSH connection, it is important to verify that the upgrade was successful. An easy way to do this is to restart your Ubuntu server:

sudo systemctl reboot

This command will restart your server and ensure that all services and configurations are updated to the latest version.

Verifying Ubuntu Version

Once your server has restarted, you can verify the Ubuntu version by running the following command:

lsb_release -a

This command will display detailed information about the Ubuntu version, including the release number, codename, and description. If the upgrade was successful, you should see that your server is running Ubuntu 20.04 LTS with the codename “focal.”

Conclusion

Upgrading your Ubuntu server over an SSH connection can be a convenient option, especially if you cannot physically access the server. However, it is important to take the necessary precautions to avoid any issues during the upgrade process.

By opening a new SSH session, performing a backup, and using the screen command to recover your session in case of failure, you can upgrade your Ubuntu server over an SSH connection safely. Additionally, verifying the Ubuntu version after the upgrade is essential to ensure that all services and configurations are updated to the latest version.

In conclusion, upgrading your Ubuntu server is an essential process that ensures your system is secure and up-to-date. This article provided a step-by-step guide to upgrading your Ubuntu server from version 18.04 to 20.04 LTS, covering pre-upgrade considerations, updating the system, configuring the Update Manager, and performing the upgrade process over an SSH connection.

Additionally, the article discussed post-upgrade verification by restarting the server and verifying the Ubuntu version. It is crucial to take the necessary precautions before and during the upgrade process to avoid any issues that could leave your server in an unusable state.

By following the steps outlined in this article, you can effectively upgrade your Ubuntu server and keep your system secure and up-to-date.

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