I have installed Oracle VM VirtualBox on Ubuntu 13.10 and I am trying to install IE8 on Windows 7 from Terminal as suggested in this answer. I am running following command on Terminal:

$ curl -s https://raw.github.com/xdissent/ievms/master/ievms.sh | IEVMS_VERSIONS="8" bash

However, after downloading the appropriate package Oracle VM VirtualBox Extension Pack, when it is getting installed, I am receiving following error on Terminal.

Installing Oracle VM VirtualBox Extension Pack 

from /home/ninad/.ievms/Oracle_VM_VirtualBox_Extension_Pack-4.3.2.vbox-extpack

0%...

Progress state: NS_ERROR_FAILURE

VBoxManage: error: Failed to install 

    "/home/ninad/.ievms/Oracle_VM_VirtualBox_Extension_Pack-4.3.2.vbox-extpack"

VBoxManage: error: The installer failed with exit code 1: 

VBoxManage: error: (gksu:8005): Gdk-CRITICAL **: 

    IA__gdk_window_set_opacity: assertion 'GDK_IS_WINDOW (window)' failed

VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), 

    component ExtPackManager, interface IExtPackManager

VBoxManage: error: Context: "int handleExtPack(HandlerArg*)" 

    at line 1143 of file VBoxManageMisc.cpp



ERROR: Failed to install Oracle VM VirtualBox Extension Pack 

   from /home/ninad/.ievms/Oracle_VM_VirtualBox_Extension_Pack-4.3.2.vbox-extpack, 

   error code (1)

Please guide me how do I continue the installation of IE8 on Windows7 in Oracle VM VirtualBox.

Update (23 Nov 2013) :

• Tried method as suggested by @rajagenupula. However, VirtualBox says that the extension pack is already installed with the same version. Do you want to reinstall it? I think this may be bacause somewhere amongst my multiple attempts, it has already been installed. I do not think reinstalling is going to help here.



• Ran command $ sudo apt-get install unar to install unar package. Without this, I was getting

  
  
  

  ERROR: Linux support requires unar (sudo apt-get install for Ubuntu/Debian) 
  
  



• Now trying to download 716 MB file of VM for IE8 by the same curl command for IE8 VM.