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Let's break down those errors messages.
chefbot_bringup: Cannot locate rosdep definition for [depthimage_to_laserscan]
This error basically tells you "while searching for the dependencies for package chefbot_bringup I couldn't find rosdep definition for depthimage_to_laserscan". If you look at wiki page of depthimage_to_lasercan package here you can see that the package is not release for melodic. This is the reason why rosdep couldn't find the definition.
rosdep command looks for the dependencies in package.xml file in each project. Have a look here where the depthimage_to_lasercan is defined.
What you need to do right now is to build the depthimage_to_lasercan from source from github (clone the package from git to your catkin workspace, catkin_make command and don't forget to source the workspace in the end).
The same idea applies for the remaining 2 packages.
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