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Unable to sudo apt-get update && sudo apt-get upgrade mariadb on debian 8.4, I have used this way of updating always, and this is the first time I see this message:

The following packages have been kept back:
mariadb-server mariadb-server-10.1
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.

But when I sudo apt-get dist-upgrade it seems to work? Why is this? is there any issues this could cause?

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There's a reason why there are two commands: upgrade only upgrades packages but never deletes any or installs any extra, whereas dist-upgrade can also add and remove packages if necessary to upgrade everything that can be upgraded. For example, if the newer version of mariadb-server depends on a newer library version, apt upgrade won't install the new library, so it'll skip the upgrade of mariadb-server. On the other hand, apt-get dist-upgrade will install the newer library.

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