# aptitude dist-upgrade Reading Package Lists... Done
Building Dependency Tree
Reading extended state information
Initializing package states... Done
Reading task descriptions... Done
Some packages had unmet dependencies.  This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.

The following packages have unmet dependencies:
  libsdl1.2debian-alsa: Conflicts: libsdl1.2-oss which is a virtual package.
                        Conflicts: libsdl1.2debian-oss but 1.2.11-8 is to be installed.
  libsdl1.2debian-oss: Conflicts: libsdl1.2debian-alsa but 1.2.11-8 is to be installed.