UbuntuHelp:HardyEnableNormalUpgrade

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https://help.ubuntu.com/community/HardyEnableNormalUpgrade

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Enable the release upgrade prompt on 8.04

By default Ubuntu 8.04 will not offer a upgrade to 8.10 to all users. This is because the 8.04 version is a long term support (LTS) release and 8.10 is a regular release. Upgrades from 8.04 to 8.10 are fully supported of course and easy to enable with the following steps:

1. Go to System/Administration/Software Sources:

1. click on the "Updates" tab and change "Show new distribution release" to "Normal releases"

1. Start System/Administration/Update Manager and click on "Upgrade"