There might be a bug in apt or some unclear dependencies in
libxmpcore-java. If I do a »apt upgrade; apt-get autoremove«,
libxmpcore-java gets installed and removed every time (that is also the
case using apt-get to upgrade so not limited to the new apt binarie).
~> apt upgrade; apt-get autoremove
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... The following package was automatically installed and is no longer required:
libxmpcore-java (5.1.2-2)
Use 'apt-get autoremove' to remove it.
Done
The following NEW packages will be installed:
libxmpcore-java (5.1.2-2)
[...]
The following packages will be REMOVED:
libxmpcore-java* (5.1.2-2)
As you can see, even apt detects bevore installing it that the package
is not needed.