On Ubuntu 16.04 I use kernel 4.4.0-78-generic for compatibility with Cuda 9 but since switching to this kernel my mouse, keyboard, wireless adapter and speakers don't work. I managed to switch to a newer mouse and keyboard temporarily which worked out the box but the speakers don't work still and I'm having to use an ethernet cable to access the internet.
I've tried for many hours to resolve each issue independently to no avail. My sense is it's somehow related to the kernel as when I do certain
sudo modprobe commands I get told things like
FATAL: Module snd-hda-intel not found in directory /lib/modules/4.4.0-78-generic but when I look in the 4.13.0-38-generic folders then the files are consistently there.
Any help appreciated, I'm at my wits end.