I have been using Ubuntu for several years, however since yesterday I have been unable to boot normally anymore, instead this message shows up.
The message says something about VirtualBox which I have installed, but I'm not sure how it's related since I have not touched it for some time. Does anyone know how to fix it? I dual boot Ubuntu with Windows.
Update: I tried using the Ubuntu Live Installation USB but it did not seem to work. Next, I tried recovery mode, then choose 'root', then in the root terminal, I uninstalled virtualbox using 'sudo apt-get remove virtualbox'. I also noticed some output about no space left on device (in /usr/man/db I think), so I went to Downloads folder and deleted everything, which freed 1GB. However now the screen shows as follows.
