Can't upgrade ubuntu server from 10.04 LTS to 12.04 LTS

To upgrade Ubuntu 10.04 server to 12.04

First make sure that you have the latest updates

sudo apt-get update & sudo apt-get upgrade

Install update-manager-core

sudo apt-get install update-manager-core

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

Launch the upgrade tool, and follow the on-screen instructions:

sudo do-release-upgrade -d

^{Source: http://library.linode.com}

Install update-manager-core .

sudo apt-get install update-manager-core

edit /etc/update-manager/release-upgrades and set Prompt=lts

then do as do-release-upgrade.

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