You might have just shot yourself rather terribly in the foot.   What we need to know now is exactly what is the system doing now.   Merely to say, “it crashed,” does not give us anything to use for diagnosis.   Also, carry this question simultaneously to any Umbuntu-specific support forums you can find, and keep us informed here.

I am not going to inquire what prompted you to do this ... it won’t help to rub salt in a wound.   Give us detailed information with which to try to help you (but not just a “data dump...”) and we will try to help you understand and resolve your problem.   But, this forum, alone, may or may not have all the Umbuntu-specific know-how that you need.   Since the situation is obviously dire, simultaneously look here and elsewhere.