Boot and reboot Windows
If you want to access to the Windows partition temporarily, you can boot and reboot Windows. At reboot it does not hibernate, and you should be able to make the computer boot into Ubuntu (instead of rebooting Windows). In this situation Windows should leave its file system such that Ubuntu can mount it.
Warning: It is safe read files, but it is risky to write files to the Windows system partition, which is usually C:
Possible workaround with a USB drive
Maybe this workaround would work for you: If you have a USB drive (HDD, SSD, pendrive or memory card) with NTFS, I hope and think that Windows will flush its buffers at poweroff even when hibernating. Otherwise it would not be safe when moved to other computers with Windows, so I think Microsoft has made it work like this, but I have not tested it.
This means that a USB drive with NTFS should be available to mount in Ubuntu and safe to read and write after being used by Windows.