When AMD64 (AMD) and EM64T (Intel) CPU technology was new and ready for the prime market, there was much talk about whether the real-world was ready for 64bit computing in the consumer sector. At the time, 64bit computing had been around in the server sector for quite some time.
A problem stil exist with 64-bit versions of * Ubuntu (linux in general) is that you install Flash plugin from the repositories (using ubuntu / kubuntu / xubuntu-restricted-extras) fails a lot, because its not a 64bit version
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