This guide will help you to upgrade from Ubuntu 9.04 Jaunty Jackalope to 9.10 Karmic Koala. This tutorial has total of 13 steps with appropriate screen shots.
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sudo apt-get update
When executing the apt-get update command, you may get “There is no public key available” warning message. This article explains how to solve this warning message message.
$ apt-get update Get:1 http://debian.linux.org.tw lenny Release.gpg [394B] Get:2 http://debian.linux.org.tw lenny Release [73.6kB] Get:3 http://debian.linux.org.tw lenny/main Packages [5310kB] Fetched 5384kB in 1m13s (73.5kB/s) Reading package lists... Done W: There is no public key available for the following key IDs: 4D270D06F42584E6 W: You may want to run apt-get update to correct these problems
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This guide will help you to upgrade from Ubuntu 8.04 Hardy Heron To Ubuntu 8.10 Intrepid. This tutorial has total of 14 steps with appropriate screen shots.
Step 1. Check the Ubuntu Version before Upgrade.
How to check the current version of Ubuntu? You have the following three options:
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My name is Ramesh Natarajan. I will be posting instruction guides, how-to, troubleshooting tips and tricks on Linux, database, hardware, security and web. My focus is to write articles that will either teach you or help you resolve a problem. Read more about 
