It seems that the upcoming version Ubuntu 13.10 will contain SDL2 [0]
(yay! cheers"!)
Also do the mixer and image libraries [1],[2]. The ttf library is still
listed as version 2.0.11 [3].
[0] http://packages.ubuntu.com/saucy/libsdl2-2.0-0
[1] http://packages.ubuntu.com/saucy/libsdl2-mixer-2.0-0
[2] http://packages.ubuntu.com/saucy/libsdl2-image-2.0-0
[3] http://packages.ubuntu.com/saucy/libsdl-ttf2.0-0