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I recently download the 64-bit version for my notebook. The notebook IS 64-bit, I checked it lots of times! But I use a pendrive and THAT .iso installed a 32-bit version. What should I do know? Where is the hidden the latest right 64-bit version? I thought to download and try to install the last 64-bit LTS to see if works!

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Please edit your question and add a uname -a output to it, like stated in the first answer. – Marc-André Appel Jan 29 '12 at 13:43

If the result to the command:

uname -a

Contains x86_64 then you are using the 64bit, else the 32.

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Huh, it contains this string three times for me, to make me really sure I have a 64-bit system :-) – Paŭlo Ebermann Jan 29 '12 at 13:26
type uname --help to see all the options – bioShark Jan 29 '12 at 13:55

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