Either busybox is really broken or I'm more stupid than I thought. After installing the transition-package I symlinked the file - and later found out, that there was no file to be symlinked at all... I forgot to install the additional package. But busybox didn't gave an errormessage after the first attempt to symlink - that's really... "bad". So - if someone has no errormessage, doublecheck if the symlink (the "ln -sf"-thing) was created correct...