virtualbox.org

I installed VirtualBox 6.1.18 on an Ubuntu 19.10 host.

When I try to install Oracle_VM_VirtualBox_Extension_Pack-6.1.4.vbox-extpack I get the following error.


Progress state: NS_ERROR_FAILURE
VBoxManage: error: Failed to install "/usr/lib/virtualbox/ExtensionPacks/Oracle_VM_VirtualBox_Extension_Pack-6.1.4.vbox-extpack"
VBoxManage: error: 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: RTVfsFileQuerySize
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component ExtPackManagerWrap, interface IExtPackManager
VBoxManage: error: Context: "RTEXITCODE handleExtPack(HandlerArg*)" at line 1362 of file VBoxManageMisc.cpp

First, re-download & try again.

Second, I am a Windows guy, and on Windows hosts Virtualbox must be run as Administrator to install the Extension Pack, because the EP goes in the Virtualbox install folder, which is in "C:\Program Files", with all of the special permissions appertaining thereto. Does Linux maybe require a "sudo" to run Virtualbox so as to add files to its install folder?

Third, the Extension Pack download file is really just a gzip archive (acording to 7-zip) and can be installed manually:
Reboot your host PC to ensure that no Virtualbox processes are running.
Open the archive with a gzip-compatible archive program.
Extract the folder named '.' (a period) to an empty folder in your Home folder.
Directly inside the extracted folder should be the Extension Pack files.
Rename the exctracted folder to "Oracle_VM_VirtualBox_Extension_Pack" (without the double quotes).
Move the extracted folder inside {wherever-Virtualbox-is-installed}/Virtualbox/ExtensionPacks
Start Virtualbox. The Extension Pack should be recognized in File menu, Preferences, Extensions.