I installed a new virtual machine yesterday. Previously, I download the guest addition iso from https://download.virtualbox.org/virtualbox/, from within virtual box.

And then mount the iso and run the VBoxLinuxGuestAdditions.run, but from yesterday, I can't access this site.

Secondly (Virtualbox 6+ onwards), I can't install the guest additions from the Insert Guest Additions CD Image under the Devices tab.

But nevertheless, I tried once more, and I get:

The network operation failed with the following error: During network request: Wrong SSL certificate format.

I need to test a software with the guest addition.

I am on Arch Linux and the VirtualBox version is 6.0.6 r129722.

What's wrong with VirtualBox?

Is there an alternative way to download the guest additions?

  • What is the host OS?, What is the guest? Apr 29, 2019 at 7:24
  • It's added - I am using Arch Linux and the VirtualBox Version is 6.0.6 r129722
    – S.Goswami
    Apr 29, 2019 at 7:25
  • And what is the guest OS? Apr 29, 2019 at 7:27
  • I have installed Linux Mint. Same goes for every other GNU/Linux and BSDs I have tried! The second problem is persistent - you can't install the CD images from the Insert Guest Additions CD Image under the Devices tab from virtualbox 6.0 onwards; so I have to look at the alternative way - downloading and mounting the iso. Which can't be done now, the site shows ``An unauthorized request".
    – S.Goswami
    Apr 29, 2019 at 7:31
  • The guest additions ISO can be downloaded without https from this folder here.
    – Freddy
    Apr 29, 2019 at 7:42

2 Answers 2


From the comments:

The current version 6.0.6 of the guest additions iso can be downloaded from http://download.virtualbox.org/virtualbox/6.0.6/VBoxGuestAdditions_6.0.6.iso https://download.virtualbox.org/virtualbox/6.0.6/VBoxGuestAdditions_6.0.6.iso
(Edit: https works again)

But get the hash from the https site, https://www.virtualbox.org/download/hashes/6.0.6/MD5SUMS and check it.

  • If downloaded using http, someone can substitute the code for other code, and do damage, or steal data. Apr 29, 2019 at 10:23
  • md5sum f7c63c2ffebc5d7ff950435d41abbfdf VBoxGuestAdditions_6.0.6.iso
    – Freddy
    Apr 29, 2019 at 10:35
  • 1
    Yes but only because that hash can be got via https. Apr 29, 2019 at 10:39

Since you have already installed Virtual Box version 6.0.8 on Arch linux, and have the error message below with Guest Additions :

"The network operation failed with the following error: During network request: Unknow reason."

Try to install a extra package (virtualbox-guest-iso) to solve the error massage above:

pacman -S virtualbox-guest-iso

  • Virtualbox says it still cannot find the file after installing that package, and wants to donload it.
    – Celsiuss
    Dec 22, 2019 at 3:16

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.