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
    – 15 Volts
    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".
    – 15 Volts
    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
  • 2
    Yes but only because that hash can be got via https. Apr 29, 2019 at 10:39
  • 1
    This method works for version 7.0.4 (just replace 6.0.6 with 7.0.4 everywhere in the URL).
    – McSuperbX1
    Dec 4, 2022 at 12:47

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

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