Dont install install linux-image-amd64 on Ubuntu 18.04

Hi
i am trying install linux-image-amd64 on ubuntu 18.04
apt install linux-image-amd64 unzip ffmpeg curl alsa-utils icewm xdotool xserver-xorg-input-void xserver-xorg-video-dummy -y
I get this:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package linux-headers-amd64 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'linux-headers-amd64' has no installation candidate

How can I resolve this?
thanks