Upgrading Ubuntu Server 12.04 LTS to 14.04

Ubuntu 14.04 LTS (long term support) is released on 17 Apr 2014. For production users, it is the time to consider upgrading 12.04 to 14.04.

Ubuntu LTS version is released every 2 years. People would like to deploy LTS version in production since the support period is five years which is much longer than other like 13.04 or 13.10. Only 6 month. !

Let 's begin the upgrade process.

Warning: You are advised to backup the existing server before upgrade !

We demonstrate the process in ssh session.

Ensure your Ubuntu server can access internet.

Ensure your current version. You can find it easily by logging in.

 

Remember to add "-d". Otherwise, you will get a message "No new release found"

Note: For LTS version, upgrade message come out when there is "point version" release e.g. 14.04.1 by default. "-d" means upgrade to development release including 14.04. If you upgrade Ubuntu from 13.04 or 13.10, no "-d" is required.

 

Type "Y" and press "Enter"

 

press "Enter" 

 

Updating the repo.

 

Type "Y" to begin installation.

leave default unless you need to disable password authentication for account root.

 

 

Installation in process...

 

Select "Yes" unless you want to be prompted for tons of questions.

 

If modified configuration file found, you will be asked to keep it or not.

 

Example, our Ubuntu 12.04 is a KVM server with qemu.conf modified. 

 

Type "Y" to remove replaced deb packages

 

Type "Y" to reboot the server.

After reboot and login again, you will find the new version is up and running.

If your Ubuntu server is installed with other applications, it is the time for you to confirm it if they are functioning properly in version 14.04.

Comment is always welcome :)