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I have Ubuntu 12.04 installed and have 14.04 iso file. Is there any way to enable upgrading using this image file and not have to download lots of files?

It's because, the Internet is a bit of a problem where I live.

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marked as duplicate by Aditya, Eric Carvalho, Richard, Radu Rădeanu, karel May 3 at 15:26

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
My question refers to the fact that upgrade from LTS to LTS is disabled and postponed to the release of 14.04.1. The addressed question does not deal with LTS-to-LTS issue. –  Mousa May 1 at 15:51
    
@Mousa: The answer in that dupe link says that offline upgrade using the iso file is not supported. So, whatever version you are using (LTS/normal), the answer would be same -- "No, offline upgrade is not supported". –  Aditya May 2 at 11:53

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