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I'm using Ubuntu 15.04. I want to update to 16.04. But the Software updater does not show the required update. How do i update?

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First make sure that your software is up to date. (run update manager) Than open the terminal Ctrl+Alt+T and run this command

sudo update-manager -d

Hit Enter and enter your password when asked.

Of course, be sure to make backup of any important data. It should not alter them, but you never know.

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In order to upgrade your distribution you may give this a try:

sudo apt-get dist-upgrade

As the manual page itself explains:

   dist-upgrade
       dist-upgrade in addition to performing the function of upgrade,
       also intelligently handles changing dependencies with new versions
       of packages; apt-get has a "smart" conflict resolution system, and
       it will attempt to upgrade the most important packages at the
       expense of less important ones if necessary.

It'll upgrade the distro to its latest version.

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First you need to upgrade to 15.10, then you can upgrade to 16.04.

From a terminal window:

  1. sudo apt-get update
  2. sudo apt-get upgrade

Reboot if asked.

  1. sudo do-release-upgrade

Answer questions and reboot as required. Now you should be at 15.10

  1. sudo do-release-upgrade

Answer questions and reboot as required. Now you should be at 16.04

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