I am running Ubuntu 12 on Virtualbox(version 4.2.6) on Mac OS X. I installed the Guest Additions by following the instructions from here(http://xmodulo.com/2013/07/how-to-install-virtualbox-guest-additions-for-linux.html) and now after I restarted, it gets stuck on the initial screen with the Ubuntu logo and the loading bar which is all lit up.
How can I get around this and perhaps revert the latest changes with the Guest Additions(I assume they are what is causing the problem)?