Can not create Ubuntu 2004 Box

[tinntvs]

I am using your repo to create a Ubuntu 2004 box 1/. Only use a script (vagrant.sh) 2/. While I running packer build file.json, I am facing the errors

• cat <<-EOF > /etc/sudoers.d/vagrant : permission denied (Some builds didn't complete successfully and had errors) 3/. uncomment at #cat <<-EOF > /etc/sudoers.d/vagrant: Build 'hyperv-iso.kms-ubuntu2004' errored after 28 minutes 39 seconds: Timeout while waiting for machine to shut down.
• Timeout while waiting for machine to shut down.