Mutliple different build fail

[DavlRannos]

New to the software and not a great programmer - using ubuntu 18.04 but keep getting

/usr/share/rubygems-integration/all/gems/vagrant-2.0.2/lib/vagrant/util/downloader.rb:259:in `execute_curl': An error occurred while downloading the remote file. The error (Vagrant::Errors::DownloaderError) message, if any, is reproduced below. Please fix this error and try again.

Could not resolve host: TODO An error occurred while downloading the remote file. The error message, if any, is reproduced below. Please fix this error and try again.

Could not resolve host: TODO Non-zero exit status... Error provisioning VMs, destroying VMs and exiting SecGen. Loading vagrant (destroy -f) in /home/fred/Bin/SecGen-master/projects/SecGen20200715_164006 ==> windows: VM not created. Moving on... Can anyone shine any wisdom upon this