[ubuntu] Upgrade from 32 bit to 64 bit

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http://ubuntuforums.org – Hi Friends, I would like to upgrade my Ubuntu 10.04.4 (32-bit) to 64 bit. It is a production server so I need to know whether any issue will come if I upgraded it to 12.04 (64 bit) or do I need to upgrade to the same version 10.04.4(64 bit). Also please let us know the best practice to upgrade from 32 bit Ubuntu OS to 64 bit. Thanks in advance. Regards, (Hardware)