My Ubuntu is being very very irritating after upgrading to 14.04. Every once in a blue moon, certain glyphs just disappear from the screen.
Every once in a while, (even as I'm writing this question), all my i's are disappearing, with nothing being shown instead.
Actually, check this out:
Before typing more: 
After typing more: 
This is a system-wide problem, some screenshots from Firefox, Nautilus, etc:
How do I fix these errors?
I have the nVidia graphics driver installed right now, but even with a pristine install (with the nouveau driver, this problem was there)
I have seen similar problems with 14.04. They seemed to be fixed in 14.10, and even better in 15.04 (this latter, specifically regarding nVidia cards). So upgrading will probably be worth a try.
The underlying problem seems to be a bug within Unity itself. I have not encountered anything like it on XFCE, KDE or Cinnamon. If you do not wish to install a full system (maybe on a second partition?), you could try one of these desktop managers, see if it plays better with your graphics card.
HTH.
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