Ubuntu 14.04 LTS (Trusty Tahr) is has been released publicly on April 17, 2014. Ubuntu provides and release upgrader by which we can easily upgrade our system to latest available release. This article will help you to upgrade Ubuntu 12.04 LTS to Ubuntu 14.04 LTS. Read more about Ubuntu 14.04 LTS.
To download Ubuntu 12.04 Trusty Tahr ISO images, Visit to http://releases.ubuntu.com/trusty/
Step 1: Install Ubuntu Core Update Mamanger
Generally update-manager-core was installed on system by default, but in case you do not have it, You can install it using following commands.
$ sudo apt-get update $ sudo apt-get install update-manager-core
Step 2: Check Current Version and Available Upgrade
To check your current running version use lsb_release command.
lsb_release -aLSB Version: core-2.0-ia32:core-2.0-noarch:core-3.0-ia32:core-3.0-noarch:..... Distributor ID: Ubuntu Description: Ubuntu 12.04 LTS Release: 12.04 Codename: precise
Now check for new Ubuntu release available to update
sudo do-release-upgrade --check-dist-upgrade-only --devel-releaseChecking for a new Ubuntu release New release '14.04' available. Run 'do-release-upgrade' to upgrade to it.
The above output showing that newer release 14.04 is available to upgrade
Step 3: Upgrade to Ubuntu 14.04 LTS
Lets execute following command to upgrade ubuntu release to Ubuntu 14.04 LTS (Trusty Tahr).
$ sudo do-release-upgrade --devel-release
The above command will take long time to execute depends on your system configuration and internet speed. This will also ask for confirmation to proceed. Using –devel-release will upgrade to development (Unstable) release