Before doing update, we need to focus on some prerequisite.
- Backup config files.
- Backup log files.
- Backup databases.
- Backup customized scripts.
- Backup other important files.
Open Terminal.
Update the repositories.
sudo apt-get update
Update Ubuntu 12.10 with its latest packages.
sudo apt-get upgrade
Reboot.
sudo reboot
Upgrade to Ubuntu 13.04.
sudo do-release-upgrade
On completion, you will be prompted to reboot your computer to take a effect of installation.
Check your version.
lsb_release -r
That’s All!