I'm trying to compile my own kernel using this guide https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel but when I'm issuing the first command
apt-get source linux-image-$(uname -r)
apt is informing me that it was not possible to find the source for packet linux,
uname -r shows that the current kernel is linux-image-4.4.0-92-generic. The same thing happens when I'm issuing this command
sudo apt-get build-dep linux-image-$(uname -r)
What should I do to be able to compile my own version of the kernel? Is the ubuntu kernel compilation guide inappropriate for elementary os?