Ailurus is not available for newer versions of Ubuntu. The last version
available was for Maverick or maybe Natty. It was a good tool at the time.
I think the source code is still kicking around, but not much use if you
want a deb. It used to be available in getdeb, but it is not in the 12.04
repositories. Using it with newer vrsion

Ubuntu Tweak will remove old kernels. Go to the Janitor tab and then Old
kernels under System section. Ubuntu Tweak is not in the regular repos.

www.liberiangeek.net/.../remove-old-kernels-from-ubuntu-12-10-with-ub\
untu-tweak/