I've just upgraded from 10.04 to 10.10 and my fonts are all just small rectangles with nothing in them. They are completely unreadable. EVEN THE FONTS IN THE TERMINAL.
Thank god the fonts in my Chromium were ok, because I wouldn't be able to find this site or write this message.
So far I've tried to use the Appearance - > Font thing and it doesn't work. For some reason there was an error with the fonts during the installation.
Please help, this is an utter nightmare...