Merge pull request #6406 from galeksandrp/download-virtualbox-org-https

They finally added https on download.virtualbox.org

builder/virtualbox/common/step_download_guest_additions.go

@@ -94,7 +94,7 @@ func (s *StepDownloadGuestAdditions) Run(ctx context.Context, state multistep.St
 		} else {
 			ui.Error(err.Error())
 			url = fmt.Sprintf(
-				"http://download.virtualbox.org/virtualbox/%s/%s",
+				"https://download.virtualbox.org/virtualbox/%s/%s",
 				version,
 				additionsName)
 		}
@@ -150,7 +150,7 @@ func (s *StepDownloadGuestAdditions) downloadAdditionsSHA256(ctx context.Context
 	// First things first, we get the list of checksums for the files available
 	// for this version.
 	checksumsUrl := fmt.Sprintf(
-		"http://download.virtualbox.org/virtualbox/%s/SHA256SUMS",
+		"https://download.virtualbox.org/virtualbox/%s/SHA256SUMS",
 		additionsVersion)
 
 	checksumsFile, err := ioutil.TempFile("", "packer")

website/source/guides/packer-on-cicd/build-virtualbox-image.html.md

@@ -68,7 +68,7 @@ apt-get install -y zip linux-headers-generic linux-headers-4.13.0-16-generic bui
 **Install VirtualBox**
 
 ```
-curl -OL "http://download.virtualbox.org/virtualbox/5.2.2/virtualbox-5.2_5.2.2-119230~Ubuntu~xenial_amd64.deb"
+curl -OL "https://download.virtualbox.org/virtualbox/5.2.2/virtualbox-5.2_5.2.2-119230~Ubuntu~xenial_amd64.deb"
 dpkg -i virtualbox-5.2_5.2.2-119230~Ubuntu~xenial_amd64.deb
 ```