What are the easy and possible ways to upgrade the operating system from 12.04 to 13.04? Are there any option except booting the system with 13.04?
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The easiest way to upgrade (IMO) is using the terminal, you do it by running the command do-release-upgrade
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Optionally if you don't feel comfortable using the terminal you could use the Update Manager, to use it press Alt+F2 and type in update-manager into the command box. Update Manager should open up and tell you: New distribution release 'XX.XX' is available. Click Upgrade and follow the on-screen instructions.
I would also recommend you read this brief guide and backup your installation.