20th September 2017, 15:59
Ah sorry, I thought you didn't have the HWE kernel installed - that you only had 4.4. Anyway, the question is why do you want kernel 4.11? Your best bet for having a stable system is going with standard LTS kernels, so either 4.4 or HWE 4.10. If it is not really requried by your hardware, I wouldn't experiment with newer kernels, if I were you ;-) If you really want to install it, then it's enough to install linux-image-4.11* and linux-headers-4.11*.