I too am seeing this error. Same circumstances as #23. I have recently installed Win 10 on sda but sda1 is not the NTFS partition, that is sda2. Ubuntu is on sdb, / on sdb2, /boot/efi on sdb1. I can find no reference to sda1 in my Ubuntu /etc or /boot so I don't know where it's coming from. Don't know if it's safe to reboot now.
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