For those that we like to try by using xe, I did this to create the correct template. I have started from a Debian 10 template, you have to replace with the correct UUID (2 VCPUs):
xe vm-install template=Debian\ Buster\ 10 new-name-label=tempforrunx sr-uuid=7c5212f3-97b2-cdeb-b735-ad26638926e3 --minimal
xe vm-param-set uuid=a2d46568-c9ab-7da2-57cb-d213ee9d8dfa HVM-boot-policy=""
xe vm-param-set uuid=a2d46568-c9ab-7da2-57cb-d213ee9d8dfa PV-args=""
xe vm-param-set VCPUs-max=2 uuid=14d91f2f-a103-da0e-51b3-21c8db307e5d
xe vm-param-set VCPUs-at-startup=2 uuid=14d91f2f-a103-da0e-51b3-21c8db307e5d
xe vm-disk-remove device=0 uuid=cb5a6d67-07d5-b5ea-358a-7ee0d6e535af
xe template-param-set is-a-template=true uuid=a2d46568-c9ab-7da2-57cb-d213ee9d8dfa
The template is listed when you issue xe template-list.
