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I want to upgrade 33 computers from 10.04LTS to 12.04LTS, but with my internet connection I cannot upgrade 33 computers, so I want to upgrade on an offline installation mode, so I have heard about the alternate CD image that is suitable for upgrading, but my question is can I use it on my USB drive for upgrading???

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From the release notes:

Upgrades from Ubuntu 10.04 LTS to 12.04 LTS do not work using the alternate CD or the server CD as a package repository. It is recommended that users running Ubuntu 10.04 LTS wait for the 12.04.1 LTS point release, scheduled for July, before upgrading.

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The only way for LTS-to-LTS upgrade I found was

do-release-upgrade -m desktop -d
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