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I want to upgrade Ubuntu 14.04.3 LTS to Ubuntu 16.04 LTS. First I run sudo apt update sudo apt dist-upgrade Then I checked Ubuntu running version: cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=14.04 DISTRIB_CODENAME=trusty DISTRIB_DESCRIPTION="Ubuntu 14.04.3 LTS" and then I star...