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cpu architecture - How do I check if I have a 32-bit or a 64-bit OS? - Ask Ubuntu

You should take in mind that you may have a 64 bit CPU while you install a 32 bit kernel. I.e. If your CPU is 64 it doesn't mean that your OS is 64, it depends on what you've installed. man uname-m, --machine print the machine hardware name -p ......

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