All having trouble updating/installing app with error: libsdl-ttf2.0... here is the solution: (This worked perfectly for me!!)
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The problem seems to be caused because apt tries to install both libsdl-ttf2.0-0 and libsdl-ttf2.0.

I resolved this by force removing the installed libsdl-ttf2 version:

Code:

$ dpkg --force-all -r libsdl-ttf2.0-0

Afterward running apt-get install -f resolved the issue and installed both packages without problems
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THANKS TO vStone Solution posted at this link: http://talk.maemo.org/showthread.php?t=59573