Add a mecanim transition in Unity 5.1.0f3 (linux)

hi! i am really new at unity, i know unity for linux is still not stable, but i don't really know if this behavior is normal :S

I have this worm model i made with blender, it has an animation of walking, and i want to use mecanim on it, anyway, whenever i right click into a state, i can't seem to find the "new transition" option D:

At this point, (i am new to blender and unity), i don't really know if this behavior is caused because i missed something on blender, or on unity, or on the importing (but i doubt so, because i am following this tutorial), or because of unity not being stable enough on linux... can somebody help me? is this a normal behavior? why i can't right click on the states?

Pic related: it's me, right clicking a state on mecanim.


edit: oops... forgot to embed the picture