I clicked on the margin of the page, which is my usual habit:
What I didn't realize was that a simple scroll upward would have revealed this about the margin:
Oh, you sneaky sneaky Visual Studio 2010 ad!
So, which was it?
sudo apt-get install rubygems libxslt-dev openssl-ruby
sudo gem install vagrantsudo bash -c 'echo "deb http://download.virtualbox.org/virtualbox/debian karmic non-free" >> /etc/apt/sources.list'
mkdir test-vagrant && cd test-vagrant
vagrant-box add karmic http://files.vagrantup.com/contrib/karmic.boxvagrant initvagrant up