[VBox-users] Is there an actual bug in extension pack install of latest version *18

[Harry P. <re...@ne...>]

NOTE: cross posted to gmane.comp.emulators.virtualbox.user and
gmane.os.openindiana.general 

NOTE: Running Vbox ... 18 on Openindiana (A solaris 11 like branch of
solaris)

My first go around using vbox on Solaris 11.  I created a vm runing
linux successfully, before I got around to installing guest extensions
and extension.pack... the new 4.3.18 was out.

So attempting to update to that I uninstalled ...16 and installed ...18.
Now attempting to install the extension.pack 

I've fished around with google for advice on how to install the vbox
extension.pack 

What I found out was that it is done directly thru the vbox
interface. You just double click the file.

Most recent extension
   Oracle_VM_VirtualBox_Extension_Pack-4.3.18-96516.vbox-extpack

So following that advice, after clicking on the file you are asked for
the role you want to use ... root already filled in so I ok that....
It ends up with this failure information

  Failed to install the Extension Pack
  /home/harry/Downloads/
  Oracle_VM_VirtualBox_Extension_Pack-4.3.18-96516(1).vbox-extpack.

  The installer failed with exit code 255: .

  Result Code: NS_ERROR_FAILURE (0x80004005)
  Component: ExtPackManager
  Interface: IExtPackManager {3295e6ce-b051-47b2-9514-2c588bfe7554}

Is this an actual bug?

I started trying to uninstall so to facilitate reinstall like:

  VBoxManage extpack uninstall "Oracle VM VirtualBox Extension Pack"
  0%...
  Progress state: NS_ERROR_FAILURE

  VBoxManage: error: Failed to uninstall "Oracle VM VirtualBox
  Extension Pack"

  VBoxManage: error: The installer failed with exit code 255:

  VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005),
  component ExtPackManager, interface IExtPackManager

  VBoxManage: error: Context: "int handleExtPack(HandlerArg*)" at line
  1183 of file VBoxManageMisc.cpp

It isn't a wrong file name failure so I guess that part was right, but
still there is something besides my commands causing the problem.

Or are my commands still not correctly formulated?

Any advice would be really welcome: