In order or probability, I think your problem is any of these:
- You didn't cd into the makehuman folder before running "makehuman". It is a known bug that makehuman doesn't keep track of where it is and simply assumes that textures are in the current directory.
- You didn't run apt-get install libsdl1.2debian libsdl-image1.2
Ie, something like running
/home/me/makehuman/makehuman won't work, you'd have to do
cd /home/me/makehuman && ./makehuman.