*Created by: juadde* **Describe the bug** Build does not finish anymore with latest changes. **To Reproduce** Steps to reproduce the behavior: 1. Fetch latest master branch 2. run `packer build -only=virtualbox-iso local.json` or `packer build cloud.json` 3. Wait for ssh_timeout to end (> 2h) 4. Build does not finish **Expected behavior** Build should finish successfully. **Screenshots & Logs** VM does not restart, even if "systemctl reboot" is sent to the machine. The VMs is stuck here:  Packer finishes with the following error: `Build 'virtualbox-iso' errored: Timeout waiting for SSH.` `==> Some builds didn't complete successfully and had errors:` `--> virtualbox-iso: Timeout waiting for SSH.` `==> Builds finished but no artifacts were created.` **Host Software (please complete the following information):** - OS: Windows / Linux - Distribution: 10 Pro / Archlinux - Vagrant Version: 2.2.7 - Packer: 1.5.4 - Hypervisor: Virtualbox - Hypervisor Version: 6.1.4 - Image Version: Current master branch - Output of `uname -a`: N/A - Vagrant Plugins: vagrant-reload (0.0.1, global), vagrant-timezone (1.3.0, global), vagrant-vbguest (0.20.0, global), vagrant-windows-update (0.0.7, global), vagrant_reboot_linux (1.0.0, global) **Additional context** Build is successful on those machines before the changes for the cloud scripts (Rebuilding the arch-box from an older commit is working properly). I will investigate to get the exact commit where the build begin to fail and report here: ea7869f1a82e51d188f6f820da3e986fa32101f2 is working properly. Please let me know if anybody have a clue on what is happening.