[ubuntu] All font just changed to square blocks

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http://ubuntuforums.org – Just had to reinstall Precise Pangolin a week after I first initially installed it. All was going well, was getting to grips with unity and starting to like it had all my apps up and running, lamp installed etc and then bang! All my font in the OS turns to [] I tried looking at the Ubuntu distro for a fix errors section but there isn't one. Has anyone else had this problem? And if it happens again is there a way to remedy it without a full install. Cheers (Hardware)