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What is the difference between apt-get update and apt-get upgrade?

Which should I run first?

Do any of them automatically run the other?

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See: askubuntu.com/questions/99033/… What is the difference between apt-get upgrade and apt-get dist-upgrade? –  david6 Jan 28 '12 at 22:49
    
Possible duplicate of: askubuntu.com/questions/81585/… OR askubuntu.com/questions/99033/… –  david6 Jan 28 '12 at 22:49
    
It's not a duplicate: this is about the difference between update/upgrade, not about the difference between upgrade/dist-upgrade. –  Andrea Corbellini Dec 28 '12 at 12:37

1 Answer 1

up vote 65 down vote accepted

You should first run update, then upgrade. Neither of them automatically runs the other.

  • apt-get update updates the list of available packages and their versions, but it does not install or upgrade any packages.
  • apt-get upgrade actually installs newer versions of the packages you have. After updating the lists, the package manager knows about available updates for the software you have installed. This is why you first want to update.
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Keep in mind that most of the times instead of apt-get upgrade what you want to do is apt-get dist-upgrade –  fdierre Jan 9 '12 at 23:41
    
For the difference between apt-get upgrade and apt-get dist-upgrade see help.ubuntu-it.org/6.06/ubuntu/serverguide/it/apt-get.html –  Pino May 20 '13 at 7:29
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You only want to do dist-upgrade when you want to upgrade to a new OS release (RARE), not just upgrade packages. upgrade is much more common and is usually what you want, unlike what @fdierre said. –  Travis R Apr 16 at 18:33
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@TravisR Not really. dist-upgrade won't upgrade to a new OS, but will upgrade to a new kernel (common enough) or a different set of dependencies (common enough) or remove dependencies that don't matter after an upgrade (also common). If you're on a home or office system, most of the time you want dist-upgrade, not upgrade. It's if you are upgrading several systems, or one that you need kept in a well-defined state that you'd want upgrade. For "regular" users (their own machine), dist-upgrade is the one to go for. –  Jon Hanna Apr 25 at 22:08

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