This one would be useful. There are several things to test, and things that may break. It is possible to get corner cases. I would suggest to get purge-old-ke

This one would be useful. There are several things to test, and things that may break. It is possible to get corner cases. I would suggest to get purge-old-kernels on 17.10 in order to test it, and decide whether to put on 18.04 LTS later on.