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I choose to install Ubuntu from Windows installer. My question is I don't know whether it is a 64-bit version 32bit version. Could any body tell me what version it is? What I want is 32-bit version cause I have a 32-bit CPU

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Possible duplicate Question See here… – Mitch May 23 '12 at 17:06

I assume that a Wubi Ubuntu is still Ubuntu, so the answers to this question should work for you: How do I check if I have a 32-bit or a 64-bit OS?

I would suggest going with the second method outlined in the "checked" answer which I have copied below.

Open a terminal window and then enter and run the command file /sbin/init
Note: You can use the keyboard shortcut CtrlAlt+T to open a terminal window.

If you have the 32-bit version of Ubuntu the result should contain ELF 32-bit as in the example below.

/sbin/init: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV) ...

If you have the 64-bit version of Ubuntu the result should contain ELF 64-bit as shown below.

/sbin/init: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV) ...

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