I had a graphics driver issue that prevented the display showing on my laptop... unfortunately I didnt have ssh installed and open and therefore I thought about booting into single user mode only to prompted by a ncurses dialog to help repair the system. Unfortunately it is rather limiting as I was hoping to install ssh and the only facility to do so would be through root access option which is available. Unfortunately like most ubuntu derivatives root users is not enabled through setting a password by default, which meant that I had a problem:)
I was just hoping to highlight this issue as most users dont set a root password, so should a problem arise that they need to use single user mode - well they are flat out of luck.
If there are any suggestions on how to circumvent this issue using the standard no root password I would be happy to hear although I think this might be one for the designers/developers to consider as a use case.