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.