Sorry for janky english, as it isnt my main language. I know theres a bunch of questions like this one but ive tried a lot of the proposed solutions and none work for me, i have dualboot with Ubuntu 20.04.2 LTS and im no expert, but from what the bootrepair log can tell, it seems that fast reboot isnt letting windows start or something, ive tried to use remove_hiberfile but it just says it cant do it since windows is hibernating, so im probably doing something wrong. Here's bootrepair's log: https://paste.ubuntu.com/p/8yZNQ4DfvP/
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sudo update-grub
from adding it to grub menu. http://askubuntu.com/questions/843153/ubuntu-16-showing-windows-10-partitions & https://askubuntu.com/questions/145902/unable-to-mount-windows-ntfs-filesystem-due-to-hibernation – oldfred Mar 22 '21 at 17:57