This box has no released versions. It will not be available from vagrant box add, nor will it show up in search results.

How to use this box with Vagrant:

Vagrant.configure("2") do |config|
  config.vm.box = "Radallin/Ubuntu_SQLServer2019"
  config.vm.box_version = "0.0"
end
vagrant init Radallin/Ubuntu_SQLServer2019 \
  --box-version 0.0
vagrant up

This version was created 3 months ago.

Basic installation according the box description

There are no providers for this version.