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I had the same problem today, but I worked around it by doing the following three commands:
sudo wget https://launchpad.net/~tiomap-dev/+archive/release/+sourcepub/1337373/+listing-archive-extra
sudo wget https://launchpad.net/~tiomap-dev/+archive/release/+files/gstreamer0.10-plugins-bad_0.10.20-1ubuntu1%2Bti0.24.9.1%2B3_armel.deb
sudo dpkg -i gstreamer0.10-sdl_0.10.20-1ubuntu1+ti0.24.9.1+3_armel.deb gstreamer0.10-faac_0.10.20-1ubuntu1+ti0.24.9.1+3_armel.deb
This installs the missing packages and let me continue installing the TI hardware drivers.