VAGRANT SHARED FOLDERS DO NOT MOUNT - Windows 7 - Vagrant 1.7.4 - Ubuntu 12.04 precise64 - VirtualBox 5.0.10 with Guest Additions - django

Question

I'm following the old tutorials off of gettingstartedwithdjango.com.
This series is quite old and I'm new to Django which is why I hit that site in the first place. It became my first introduction to Vagrant. Because the series is old and there are now new versions of Django, Vagrant, etc, I've found just getting through the first tutorial was quite difficult. This was mainly just the gap between Django v1.4 and the current version 1.9 which is what I'm running, including some syntax differences in settings.py and also some discrepancies between the text errata and the video which I had to sort through. It's a pretty detailed exercise if you're completely new to all of this (which I am), so it was quite challenging, and I was thrilled when after probably 12 hours of solid effort I was able to get everything working as was being described in the video but using all new versions of software. Once I got it all set up and working, I halted my Vagrant VM for the night and when I turned it back up (vagrant up) the next morning, I found that the VM would no longer mount its shared folders, essentially rendering the Vagrant VM useless to me as I'm then unable to run code which resides on the host machine (I'm running Windows 7) from within the VM (which is accomplished via the VirtualBox shared folders feature).
Not knowing what was wrong, this prompted me to completely reinstall my Vagrant VM. I was able to get things redeployed successfully with about one hour worth of effort, backtracking through steps I had taken to successfully complete the first tutorial in the first place, in order to back to the same point where I started (before I did the previous vagrant halt). When reinstalling the Vagrant VM I noticed messages that my VirtualBox Guest Additions (4.2.0) did not match the version of VirtualBox I have installed (5.0.10), which I recalled seeing the first time but ignored because it also said this isn't usually a problem and should work (if it weren't for bad luck, I'd have no luck at all). Since for me it didn't work, this led me down a whole rabbit hole of posts from various websites including SO, which ultimately had me updating my Vagrant VM, downloading/mounting/building/installing a new version of VirtualBox Guest Additions, and reloading my Vagrant VM only to wind up in the same boat. Shared folders were still not working!
To be very specific, this is more or less what I tried based on information from many websites:
cd /home/vagrant
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install dkms build-essential linux-headers-generic
sudo apt-get install linux-headers-3.2.0-23-generic
# mounted VBoxGuestAdditions_5.0.10.iso to Vagrant VM
cd /media/cdrom
sudo sh ./VBoxLinuxAdditions.run
sudo reboot
sudo /etc/init.d/vboxadd setup
sudo reload
c:\VAGRANT\vagrant plugin install vagrant-vbguest
c:\VAGRANT\vagrant reload
I was utterly convinced this was going to resolve the issue but it didn't.

Answer 1

Then I found this gem:
http://ddelizia.blogspot.com/2011/02/how-to-share-folder-on-virtual-box-with.html
This shows how to, from within the Vagrant VM, mount the shared folders back to your Windows 7 host. To be specific, here's what I did when I found things were working again:
cd /vagrant
ls -la
<this yielded nothing>
sudo mount.vboxsf vagrant /vagrant # see your VirtualBox Shared Folders settings
cd ~ # /home/vagrant
cd - # /vagrant
ls -la
# this yielded the expected folders from my Win7 host
In the mount.vboxsf command above, the first vagrant (without the /) came from the Name column in my VirtualBox shared folders settings. This is essentially an alias which is used to refer to the actual path on the Win7 host, in my case: C:/VAGRANT. The second vagrant (with the /) in that command is the /vagrant folder on the Vagrant VM (linux).
Given that I spent most of today messing with this and I figure there are plenty of people who are going to run into this same or related problem, I thought I would try to help out and save you all a bunch of time. Good luck.