====== Ubuntu - apt-get - Upgrade installed packages ======

<code bash>
sudo apt-get upgrade
</code>

<WRAP info>
**NOTE:**  This will upgrade all installed packages.
</WRAP>

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===== To upgrade only a specific program =====

<code bash>
sudo apt-get upgrade <package_name>
</code>

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===== Another way to perform a complete upgrade =====

<code bash>
sudo apt-get dist-upgrade
</code>

<WRAP important>
**WARNING:**  It is recommended to avoid using this command.

  * The command **apt-get upgrade** is very obedient.
    * It never tries to remove any packages or tries to install a new package on its own.

  * The command **apt-get dist-upgrade**, on the other hand, is proactive.
    * It looks for dependencies with the newer version of the package being installed and it tries to install new packages or __remove__ existing ones on its own.
    * It has a “smart” conflict resolution system. It will attempt to upgrade the most important packages, at the expense of the less important ones.
      * This may lead to the removal of some packages, which you might not want. This is the main reason why dist-upgrade should be avoided on production machines.
</WRAP>

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