The ubuntu-14.04.4-server-amd64 image does no longer exist
at Trusty repo, so PACKER_BOX_NAME's value is updated along
with the iso_checksum's value.
Also, the 'vagrant box add' command shown in ReadMe has
slightly different syntax at the moment, so, its current
version fails with syntax error. The 'name' parameter moved
to its expected location will resolve it.
The ubuntu-14.04.4-server-amd64 image does no longer exist at Trusty repo, so PACKER_BOX_NAME's value is updated along with the iso_checksum's value.
Also, the 'vagrant box add' command shown in ReadMe has slightly different syntax at the moment, so, its current version fails with syntax error. The 'name' parameter moved to its expected location will resolve it.