Dependencies problem

[Eduard Bonet]

After updating i cannot install some programs because of "broken
dependencies". When i type

sudo apt-get upgrade

nothing occurs. But when i type, for example

sudo apt-get install mplayer

I get a message saying that mplayer depends on libdirectfb-0.9-22 but it is
not installable (E: broken packets -i am translating from catalan and it
could be another thing instead of "packets").

How can i solve this?
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