I have a dual-booted laptop with windows10 and ubuntu. they are separate partitions on a single Hard drive my current windows version is windows 10 1909 and I have an update to windows10 21h2 on windows update assistant. if I download and install that update does it affect my laptop or my grub boot menu how do I update windows?
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Sometimes such updates work well. Sometimes they mess up with grub, and you will have to boot from a live CD to fix it. – Archisman Panigrahi Dec 01 '21 at 06:50
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1Good backups of both Windows & Ubuntu always recommended. And particularly before any major update/change. Backups should be a regular process, so not specifically required with an update. – oldfred Dec 01 '21 at 15:55
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Updating Windows will overwrite Ubuntu's bootloader. – C.S.Cameron Dec 01 '21 at 17:12
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Does this answer your question? Is it safe to install Service Pack 1 update on an already dual booted windows 7 and ubuntu 14.04? – karel Dec 02 '21 at 00:42
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There's a difference between UEFI installations and Legacy/BIOS installations. Problems may occur with the latter and rarely if ever with the former.
With UEFI installations typically the Windows feature updates change the boot order to Windows, for convenience, because it needs several reboots to finish. It's just a matter of opening UEFI settings > Boot and change it back to "Ubuntu".
With Legacy/BIOS installations it may replace Grub and, in the past, some instances of "broken" partition table have been reported, but not lately. Grub needs to be reinstalled if the Windows feature update installation replaced it with the Windows bootloader.
Assuming you're using a modern UEFI computer (anything from at least 2012 and newer) and the dual-boot has been properly set in UEFI mode you have nothing to worry about. Worse case scenario is only the minor inconvenience of changing one firmware setting back to what it was.
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