apt-mark hold linux-generic-hwe-18.04
apt-mark hold linux-signed-generic-hwe-18.04
apt-mark hold linux-image-generic-hwe-18.04
apt-mark hold linux-headers-generic-hwe-18.04
apt-mark hold linux-headers-4.18.0-15
apt-mark hold linux-headers-4.18.0-15-generic
apt-mark hold linux-image-4.18.0-15-generic
apt-mark hold linux-modules-4.18.0-15-generic
apt-mark hold linux-modules-extra-4.18.0-15-generic