How to Upgrade to Ubuntu 14.04 LTS

Ubuntu 14.04 is a long-term support (LTS) release that will be supported until April 2019. This guide explains how to upgrade your Linode from Ubuntu 12.04 (Precise Pangolin) to Ubuntu 14.04 (Trusty Tahr).

Caution

Distribution upgrades can yield unpredictable results, due to variations in software stacks. When possible, we recommend:

• Creating a new Linode with the latest disk template
• Rebuilding your stack
• Transferring your data
• Swapping IP addresses

In addition, you should use LISH to perform this upgrade as, in the event your internet connection is disconnected, your system may end up corrupted or the upgrade may be incomplete.

Note

This guide was written assuming that you have root access to your Linode. If you do not have root access, you will need to prepend each command with sudo.

Before upgrading, you will need to prepare your Linode to be upgraded. In order to do so, we will:

1. Install updates for Ubuntu 12.04

2. Backup your data

3. Check to ensure the kernel version you’re using is the latest kernel

4. Stop non-critical services

5. Start a LISH session to ensure that the installation is not interrupted

Each of these will be discussed in more detail below.

Note

In the interest of security, Ubuntu 14.04 LTS disables password based SSH authentication for the root user. If you log into your root account directly via SSH, you will need to ensure that you have configured key based authentication prior to following these upgrade steps. If you have already followed our steps for adding a new user to your Linode, you should be able to log in with that account after the upgrade process has completed.

You should install all available updates for Ubuntu 12.04 LTS before upgrading to Ubuntu 14.04 LTS. You can do so by running these commands:

1. Update your package lists by entering the following command:

   apt-get update
   

2. Install the updates by entering the following command:

   apt-get upgrade
   

Any available updates for Ubuntu 12.04 LTS will be installed on your Linode.

It’s a good idea to back up your Linode before performing a major upgrade. That way, you can restore from backup if anything goes wrong during the upgrade process. If you subscribe to the Linode Backup Service, we recommend that you take a manual snapshot before upgrading to Ubuntu 14.04 LTS. If you use another backup service or application, we recommend that you make a manual backup now.

Verify that your Linode is using the latest supported kernel. See Applying Kernel Updates for more information.

We recommend that you stop as many services as possible before upgrading to Ubuntu 14.04 LTS. This includes web server daemons (Apache and nginx), database servers (PostgreSQL and MySQL), and any other non-critical services. To stop a service, enter the following command, replacing apache2 with the name of the service you want to stop:

service apache2 stop

You are now ready to install Ubuntu 14.04 LTS on your Linode.

Here’s how to upgrade from Ubuntu 12.04 LTS to Ubuntu 14.04 LTS:

1. If it’s not already installed, enter the following command to install the update-manager-core package:

   apt-get install update-manager-core
   

2. Open the release-upgrades file for editing by entering the following command:

   nano /etc/update-manager/release-upgrades
   

3. Verify that the following line is present in the file, and that Prompt is set to lts:

   Prompt=lts
   

4. Exit nano and upgrade your Linode to Ubuntu 14.04 LTS by entering the following command:

   do-release-upgrade -d
   

5. Follow the on-screen instructions to complete the installation process. You will be prompted as to whether you wish to continue; as you are on LISH, it is safe to continue via SSH.

6. Because Linode offers internal package mirrors for Ubuntu, you may see this message:

   No valid mirror found
   
   While scanning your repository information no mirror entry for the
   upgrade was found. This can happen if you run an internal mirror or
   if the mirror information is out of date.
   
   Do you want to rewrite your 'sources.list' file anyway? If you choose
   'Yes' here it will update all 'precise' to 'trusty' entries.
   If you select 'No' the upgrade will cancel.
   
   Continue [yN]
   

   Type y and return to continue.

7. The upgrade will cause your Linode to reboot. After it does so, verify that it’s running Ubuntu 14.04 LTS by entering the following command:

   cat /etc/lsb-release
   

8. You should see output that resembles the following:

   DISTRIB_ID=Ubuntu
   DISTRIB_RELEASE=14.04
   DISTRIB_CODENAME=trusty
   DISTRIB_DESCRIPTION="Ubuntu 14.04.1 LTS"
   

Your Linode is now running Ubuntu 14.04 LTS.

If your Linode is running an release of Ubuntu older than 12.04 LTS, use the upgrade guides in the Upgrading section to upgrade to Ubuntu 12.04 LTS first. You may then upgrade your Linode to Ubuntu 14.04 LTS.