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I am trying to install the virtualbox extension pack (Oracle_VM_VirtualBox_Extension_Pack-6.0.4) and I get the following error.

Failed to install the Extension Pack /home/user/Downloads/Oracle_VM_VirtualBox_Extension_Pack-6.0.4.vbox-extpack.

Failed to load the main module ('/usr/lib/virtualbox/ExtensionPacks/Oracle_VM_VirtualBox_Extension_Pack/linux.amd64/VBoxPuelMain.so'): VERR_FILE_NOT_FOUND - /usr/lib/virtualbox/ExtensionPacks/Oracle_VM_VirtualBox_Extension_Pack/linux.amd64/VBoxPuelMain.so: undefined symbol: _ZNK16RTCRestArrayBase9baseCloneEv.

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Check your version of VirtualBox, I had v5 attempting to install Extension Pack v6 which caused the error. Upgrading VirtualBox to v6 fixed it. Or install the Extensions pack version for your installed version of VirtualBox.

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0

Error NS_ERROR_FAILURE (0x80004005) appears also in case if you try to install VirtualBox extension pack being a usual user. It could not be considered as an answer to actual question, but could be useful for users who search for Failed to install the Extension Pack error message which is present in this case too.

In this case

  • you need to run your VirtualBox with sudo privileges from terminal:

    sudo virtualbox
    
  • Virtualbox could offer you to download and install extension pack

But if you ignored that, you could do it the next way:

  • install extension pack that matching your virtualbox version using

    File -> Preferences -> Extensions

  • close and reopen VirtualBox using a regular user's account
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