After sady days away from my GNU/Linux i found this Issue on WSL's repo. Not surprisingly was something related with the ownership of the ext4.vhdx
file which was set to another user, probably my old user from the previous Windows i had, the one i formated (forgot about that in the description, sorry).
So just change the owner to your current user:
Right Click > Properities > Security > Advanced > Change Owner
Thanks to this guy. I'll close the question.