Chose Portuguese language in GDM: worked properly.
But then chose English (United States) and it seemed to go from gdm to kdm by itsef. Perhaps gdm crashed and it reverts to kdm? Tried to choose "configuration" again, but a message showed up saying I wasn't running gdm!
By nature, X will look for a manager, first looking for GDM, then if it doesn't find it, it will look for another, KDM, and even then, if it doesn't find that it will look for another ...
(not necessarily in this order).
So in short, yes, it will "default" to another manager if there is one installed.
If I could get you to switch languages again in that order, see if the "crash-and-switch" happens again (that's just my nickname for that
) And then try other languages, back to US/english, and see if it's just that or all... ty.