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I currently am using a desktop that I dual boot Windows 10, 64-bit and Ubuntu 32-bit. I should have installed 64-bit Ubuntu all along but for some reason, I didn't.

I'm fine losing my Ubuntu install and want to reinstall a fresh 64-bit Ubuntu in that partition. What I'm worried about is losing my Windows 10 64-bit install.

So instead of having Win10-64 and Ubuntu-32, I want to change this to Win10-64 and Ubuntu-64 without affecting Win10-64.

Will doing the Ubuntu 32-bit to 64-bit upgrade via USB Stick cause me to lose my Windows 10 64-bit install?

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    You can install Ubuntu x86_64 over the x86 (32-bit) install without touching your windows 10, or in fact loosing any of your user files on Ubuntu unless you select the 'use entire disk' or 'format' options on install. ie. just read & choose the correct options (I usually prefer something-else and ensure 'format' box is unticked/unchecked. Using something-else without format will cause it to re-add back any additional software you've already added (if from Ubuntu repos); other options I don't believe will do this) – guiverc Jun 19 at 13:25
  • Ah man that's great news! Thank you very much. I mostly use the Ubuntu install to help me repair other types of file systems so I'm not worried about losing anything on there, but on Windows I do all kinds of other stuff. Thanks for your help. I had searched around for days looking for someone with a similar problem and couldn't find anything quite like my situation. I'm glad I asked. – user7112532 Jun 19 at 14:17
  • Don't forget to backup. It's easy to make a mistake & format in error, or power drops out, battery fails or maybe a spaceship lands on the house etc, so backup first. You're unlikely to use it, but better safe than sorry. – guiverc Jun 19 at 14:20
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    Hey thanks again. Everything went perfectly. – user7112532 Jun 20 at 1:24
  • Please post your solution as an answer below by clicking the 'Answer your question button. It's absolutely fine (and very much encouraged) to self-answer your question. – pomsky Jul 26 at 5:38

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