Lubuntu Shared Folder issue in VirtualBox 4.2.18

[Dale Visser]

This may be of general interest to users of other Ubuntu 3.10 variants 
as well. The following is copied from my blog post at http://bit.ly/177408M:

Yesterday, I upgraded my Ubuntu Gnome 13.04 (64-bit) virtual machine to 
Lubuntu 13.10. I rely on the VirtualBox Shared Folders feature to keep 
my git repositories in sync with bare copies on network drives at my 
workplace. (My Host OS is Windows 7, and my workplace IT infrastructure 
is Windows-based.)

To my horror, today I discovered I could not access my shared folders 
from my new Guest OS. I even created a “clean” new Lubuntu 13.10 guest 
machine, which exhibited the same issue. (Yes, I carefully performed the 
dance of apt-get update, upgrade, install dkms, install guest additions, 
and rebooting after each install.) So I knew it wasn’t an issue with the 
upgrade process.

Then, I remembered that the other day, I saw an Oracle announcement that 
VirtualBox 4.3.0 had been released. I’m running version 4.2.18. Sure 
enough, upgrading to the latest VirtualBox, and installing its Guest 
Additions solved the issue. I’m assuming there have been changes in the 
Linux Kernel (Ubuntu 13.10 is running the 3.11 kernel) that necessitated 
updates to Guest Additions.