If you try to launch ibb & obb on linux, via steam and you see a black screen for a millisecond, or nothing seem to happen at all, here the solution (solution by LittleJawa):

cd ~/.local/share/Steam/steamapps/common/ibbandobb

Edit ibbobb.elf

Replace:

export LD_LIBRARY_PATH=$(pwd)

export LD_LIBRARY_PATH=$(pwd):$LD_LIBRARY_PATH