vagrant up --no-provision
vagrant ssh
sudo apt-get update
exit
vagrant up

if you have networking problems:

sudo /etc/init.d/networking restart

git-clone your magento to data/magento, import your mysql database run the query:

update magento.core_config_data
set value = 'http://vagrant-magento:8080/'
where path in ('web/unsecure/base_url', 'web/secure/base_url')

and clear the magento cache (var/cache/)

Now have fun (kind of hard considering it's magento, but hey.. at least you didn't pollute your computer with this shit).