On Wed, 24 Oct 2012 11:32:32 -0400, you wrote:

>I have just upgraded VirtualBox on my MS Win 7 laptop from 4.2.0 to
>4.2.2r81494.  The upgrade went smoothly and the app downloaded and loaded
>the appropriate extension pack.
>
> 
>
> However, when I use the new VM and  attempt to install the extension pack

I think you mean: Guest Additions. The extension pack is installed in
the VBox installation on the host, the Guest Additions in a supported
guest OS.

> (as root) the system won't execute VBoxLinuxAdditions.run, although the
> permissions are -r-xr-xr-x.  I suspect because it's a binary file ad I don't
> know how to tell the system to run the file.

You don't have to suspect anything, the (beginning of the) file is very
readable. It's an installer shell script, followed by the installation
package itself, much like a shar.

Must Linux and Unix systems do not have the current directory (also
known as . ) in the PATH environment variable, so you will have to
specify the path. Considering your limited Linux experience, I would
advise you not to use root logins at all to prevent accidents.

Anyway, if you are root:

cd "mountpoint of VBoxAdditions here"
sh ./VBoxLinuxAdditions.run

If you are a "primary user" (with sudo permissions):

cd "mountpoint of VBoxAdditions here"
sudo sh ./VBoxLinuxAdditions.run


-- 
Groet, Cordialement, Pozdrawiam, Regards,

Kees Nuyt


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