on 2014/05/27, kernel-remover worked fine with Alt-F2 "kdesu kernel-remover".
I have not tried it in the interim, but as of today it will not work either from a terminal or using Alt-F2. In the terminal, there is no output, the display returns to a root prompt.
Running kernel-remover -F displays the same dialog produced by kernel-remover -h.
It will produce the expected results if I start it with kernel-remover -f