So how can you check that you have the hardware to run 64 bit software?
Well mostly you check it before you buy it - but there is another way:
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grep flags /proc/cpuinfo
in a terminal and see if you can find lm flag somewhere in the output. If it is there; you can run 64 bit software.
So if you are already running Linux you can now check if your kernel can run 64 bit software with:
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getconf LONG_BIT
If the output is 64 then you are ready to install 64 bit software if it is 32 - it is not.