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I have around 10 PCs, they currently have Ubuntu 11.04 running. I need to upgrade the PCs from 11.04 to 12.04 without downloading all the Ubuntu Packages every time. What would be the best way to upgrade them? I do not want to loose settings and/or data on these PCs, so re-installing is not an option.

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up vote 0 down vote accepted

Simple: Create a 12.04 CD or USB- Stick, boot it up and choose the upgrade option when asked.

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You will not loose any settings and/or data this way.

EDIT: It seems I didn't do my homework properly, I'm sorry. You will have to do the whole procedure twice, first by upgrading to 11.10, and then to 12.04. I wish there was a better solution (besides a fresh install), however I don't know of any.

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-1 It is impossible to upgrade from 11.04 to 12.04 directly This upgrade is dangerous This upgrade may lose packages –  Tachyons May 4 '12 at 11:19
    
Thanks, fixed it. –  Basscal May 4 '12 at 11:36
    
I had gone through your answer but the upgrade option already disable. –  diff May 5 '12 at 8:34
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