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I have a dual-boot set up with Ubuntu 14.04, Win 8, and a Storage partition. Since my Win 8 partition is full, I have to choose the Storage partition during the Win 10 upgrade menu.
During the upgrade, after one of the many restarts, I cannot boot into the Win 8 partition from Ubuntu's grub menu anymore. It only shows a purple screen and get stuck.
When I try to boot into Ubuntu partition, there's an error:
An error occurred while mounting /media/james/Storage
Press S to skip mounting or M for manual recovery
Thus, I suspect the error is due to my choosing the Storage partition during Win 10 upgrade.
When I press M for manual recovery and try to manually mount, there's more information:
> mount /media/james/Storage
The disk contains an unclean file system (0, 0).
Metadata kept in WIndows cache, refused to mount.
Failed to mount '/dev/sda4': Operation not permitted
The NTFS partition is in an unsafe state. Please resume and shutdown
Windows fully (no hiberation or fast restarting), or mount the volume
read-only with the 'ro' mount option.
What to do in this situation? I can't boot into Windows to fix from that side.
Please quote the essential parts of the answer from the reference link(s), as the answer can become invalid if the linked page(s) change. – DavidPostill – 2016-05-21T20:03:43.710