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Posted: Mon Jan 12, 2026 4:09 pm
by Kfxeh
Can confirm. Also, have you double-checked that your PC meets all the Windows 11 requirements, like TPM 2.0?
Posted: Mon Jan 12, 2026 4:48 pm
by xS6ab2
This happened to me. I had to temporarily disable the Ubuntu bootloader from my BIOS boot order to get the Windows 11 install to complete.
Posted: Mon Jan 12, 2026 9:28 pm
by TeFwofQYEK
This. I had the same problem. After disabling the other OS in the boot order like they said, I also had to disconnect my Ubuntu drive physically to stop the rollback.
Posted: Mon Jan 12, 2026 10:08 pm
by lngg34695
Yeah, that's the move. One extra tip: after you reconnect the Ubuntu drive, you might need to run a quick repair on the Windows bootloader from your installation media. Good luck!
Posted: Tue Jan 13, 2026 12:27 am
by 6537num
Same here. Also, have you double-checked that your TPM is enabled and meets the 2.0 requirement in your BIOS?
Posted: Tue Jan 20, 2026 4:21 am
by 98xnmlscjoln
Yeah, that error's a pain. One extra thing: try temporarily disconnecting your Ubuntu drive during the upgrade, then reconnect it after.
Posted: Mon Feb 02, 2026 10:58 pm
by lf64418
This happened to me. I had to disable BitLocker on my Windows drive before the upgrade would finally go through. Hope that helps.
Posted: Mon Feb 09, 2026 4:44 pm
by wdhBnwRZ
Also, have you checked if your Ubuntu partition is causing any bootloader conflicts during the upgrade?