This is from your Casper.txt:
Windows is hibernated, refused to mount.
Falling back to read-only mount because the NTFS partition is in an
unsafe state. Please resume and shutdown Windows fully (no hibernation
or fast restarting.)
Does it install grub after that?
** Changed in: grub-installer (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1908372
Title:
Installation alongside debian and windows 10 failed upon grub install.
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