Upgrade Ubuntu Server to 12.04 LTS

Install the update-manager-core package if it is not already installed:

sudo apt-get install update-manager-core

Edit /etc/update-manager/release-upgrades and set Prompt=normal;

vim /etc/update-manager/release-upgrades

Launch the upgrade tool with the command

sudo do-release-upgrade -d

There will come a point where you will be listed a set of changes – this is vim. To exit press

:q

Also, since there is a chance of failure, a second SSH port is opened in case it is required. you will need to put a hole in your firewall to allow this

> iptables -I INPUT -p tcp --dport 1022 -j ACCEPT

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