Remove 4.* series kernel from 18.04

[jon danniken]

Hello list, some time ago I installed the Hardware Enablement (hwe)
kernel on my 18.04 box.  For some reason I am still getting updates
for the 4.* series kernel, and I would like to prevent this.

I'm pretty sure this entails removing linux-generic, but I was hoping
for some confirmation before I try this.

Thank you,

Jon