``==> vbox (vagrant): Creating Vagrant box for 'virtualbox' provider vbox (vagrant): Unpacking OVA: build/2018-05-26-18-12-14/base-bionic.ova vbox (vagrant): Renaming the OVF to box.ovf... vbox (vagrant): Using custom Vagrantfile: source/ubuntu/bionic/base.vagrant vbox (vagrant): Compressing: Vagrantfile ==> vbox: Running post-processor: shell-local ==> vbox (shell-local): Post processing with local shell script: /tmp/packer-shell679910228 Build 'vbox' errored: 1 error(s) occurred:
Post-processor failed: archive/tar: cannot encode header: Format specifies GNU; and GNU cannot encode Uname="[email protected]"`