What steps do I take to upgrade from LTS 12.04 to LTS 14.04 with the least amount of trouble and loosing the fewest amount of data.

  • Did you try sudo apt-get update && sudo do-release-upgrade -d?
    – jobin
    May 2 '14 at 13:16

You can upgrade ubuntu 12.04 to 14.04 with do-release-upgrade command Also check http://www.omgubuntu.co.uk/2014/04/upgrade-ubuntu-14-04-12-04

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