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I use 32-bit versions of Lubuntu and Windows on my AMD Phenom II X2 555, 32/64-capable PC.

If I update Lubuntu to a 64-bit version, will I still be able to boot both OSes?

[If it is relevant, the Windows boot option is itself a fork to either Win2k, 32bit or W7, 32bit - and, for driver-availability reasons, I don't want to change either to 64bit.]


I've attempted to add Lubuntu 22 to a hard drive that already had W7 32-bit on it. It didn't work. Then the hard drive I'd perched on top of the PC slid off the PC and struck the PC's monitor screen.

Getting to be a rather expensive experiment!

Thanks for your thoughts. I'll pause the experiment.

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    You cannot update a armhf (32-bit ARM) or i386 (32-bit x86) to arm64 or amd64 respectively; to change architectures requires a re-install
    – guiverc
    Feb 21 at 21:26

1 Answer 1

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You cannot update a armhf (32-bit ARM) or i386 (32-bit x86) to arm64 or amd64 respectively; to change architectures requires a re-install.

You can have installed i386 and amd64 installs on the same hardware; if the machine is capable of running both. The same may also apply to ARM 32bit & 64bit, but I've not tested that.

For my own systems, I re-installed using the method described in this question.

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  • In QA-testing (Quality Assurance); I have boxes with many installs. As the last i386 or 32-bit x86 install was 2020-August, it's been awhile since I've included i386 and amd64 installs on the same box, but Ubuntu no longer supports i386 so not x86 32-bit are used in QA testing. Lubuntu hasn't supported 32-bit since 2021-April.
    – guiverc
    Feb 21 at 21:28
  • FYI: In "for my own systems" I mean systems I keep for myself.. Installs/systems I use in QA vary in what is done depending on what is useful to QA-test install.. I'll non-destructively re-install often so as to keep data giving the new install something to test with; but that restoring of data post-install is more common in QA.
    – guiverc
    Feb 21 at 21:32

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