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I am using ubuntu 12.04 LTS (64bit) in 64 bit machine. But I want to use a 32-bit operating system (either 12.04 or 8.04), I tried to do it using bootable pen drive but it failed, while I have alreay changed my OS from 12.10 (64 bit) to 12.04 (64bit) using bootable pendrive. Any kind of help will work.

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marked as duplicate by Alvar, Mitch, Eric Carvalho, Warren Hill, Kevin Bowen Aug 11 '13 at 10:09

This question was marked as an exact duplicate of an existing question.

If a machine is 64-bit capable it's also 32bit capable. Just backup and do a clean install of the OS you want. – Warren Hill Aug 11 '13 at 8:26
please tell if any linux command is there to change a 12.04(64 bit) to 12.04(32 bit) – ashish Aug 11 '13 at 10:03

32 bit operating systems should work fine on 64 bit systems. I think you did something wrong when creating your bootable pen drive.

Maybe this link can help you:

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actually , i made the pen drive bootable using terminal commands, and as i did it earlier for ubuntu 12.04, its perfectly fine. – ashish Aug 11 '13 at 5:13
also, i need to know installation procedure,as i am using ubuntu 12.04(64 bit) and i have made the bootable pen drive. – ashish Aug 11 '13 at 5:19
while booting from usb key, it is showing error, though i have set the priority as usb key on top – ashish Aug 11 '13 at 5:27

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