switching from 32-bit to 64-bit

[dsr-mzpnVDyJpH4k7aNtvndDlA at public.gmane.org (Dan Ritter)]

On Thu, Jul 29, 2010 at 10:12:01AM -0400, Seth Gordon wrote:
> I have a desktop machine at home that used to run 64-bit Ubuntu.  Then 
> the hard drive went south, so I got a fresh drive, bought an Ubuntu 
> CD-ROM from the Micro Center, did a fresh install from the CD-ROM, and 
> then upgraded over the network to the then-latest version.
> 
> At some point I noticed that I was running the 32-bit version of the OS, 
> not 64-bit.  Is there a relatively painless way to move everything over? 
>   (I need to upgrade it from 9.10 to 10.04, in any event.)

Nope. Unlike switching kernels, x86-32 to x86-64 is a complete
architecture change. 

There is no in-place upgrade. Your best bet is to add a disk,
install 64-bit on that, test things, and move data over.

-dsr-



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