title: VirtualBox extension pack error
body: <p>I purchased a network card to give a separate network to my virtual machine. My host OS is Ubuntu 14.04 . Also i need to mount the USB to my virtual machine and not my host OS, so i downloaded extension pack version 5.0.2 for Vbox-5.0 . While installing virtual box extension pack, there were two VM's running and i got this popup.</p>
  
  <pre><code>Failed to install the Extension Pack /home/aniket/Downloads/Oracle_VM_VirtualBox_Extension_Pack-5.0.20-106931.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: RTLogRelGetDefaultInstanceEx.
  
  Result Code: NS_ERROR_FAILURE (0x80004005)
  Component: ExtPackManager
  Interface: IExtPackManager {3295e6ce-b051-47b2-9514-2c588bfe7554}
  </code></pre>
  
  <p>Even after power off of VM's and restarting the host OS, I get this similar error code.</p>
  
  <p>Sorry if you think the question is not formatted properly or any other issue with my question. This is my second post, please tell me if there are any things i need to correct in my question.</p>
  
  <p>Thanks in Advance.</p>