apt not upgrading package

[Ralf Mardorf]

On Sat, 4 Jun 2016 18:22:04 -0400, Peter Silva wrote:
>upgrade only works if an older version of mosquitto is already
>installed.
>
>On Sat, Jun 4, 2016 at 4:54 PM, Colin Law wrote:
>> $ apt-cache policy mosquitto
>> mosquitto:
>>   Installed: 1.4.8-1build1
     ^^^^^^^^^
     ^^^^^^^^^

On Sun, 05 Jun 2016 07:32:43 +0200, Nils Kassube wrote:
>Could it be that one of the dependencies for the new version is
>missing?

Something similar was my thought too. Assumed "dist-upgrade" would
handle it "smart" without informing the user, wouldn't at least
"upgrade" inform about the available newer version and a missing
dependency or conflicting packages?