I have a Dell Inspiron 5568 laptop that is no longer booting up under Windows 10. The native (Dell) recovery options are not allowing me to backup any of my data prior to attempting a factory reset. Consequently, I have changed the BIOS settings for "legacy boot" and booted up from an Ubuntu Live 16.04 USB stick. Here is what I see

 parted -l reports

 Partition 1  524Mb  FAT32 EFI System partition             boot,esp
 Partition 2 134Mb         Microsoft reserved partition     msftres
 Parition 3  495Gb         Basic data partition             msftdata
 ...
 Parition 8  148Gb         Basic data partition             msftdata
 Parition 9  472Mb  ntfs                                    hidden,dflag
 Two more hidden ntfs paritions

fdisk -l reports

/dev/sda1    500Mb  EFI System
/dev/sda2    128Mb  Microsoft reserved
/dev/sda3    460G   Microsoft basic data
...
/dev/sda8    138Gb  Microsoft basic data
/dev/sda9    450M   Windows recovery envirionment
Two others

Before I attempt to do anything else I would like to mount /dev/sda6 and get a safe backup of some critical files I have there. The trouble is it is not clear to me how I mount that partition. I tried

mkdir /media/windows
sudo ntfs-3g -o force,rw /dev/sda6 /media/windows

only to be told that it is not an NTFS parition. If memory serves me right when I did the parititiong I had used the Windows 10 default which I think is FAT32. So I did try

mount -t vfat /dev/sda6 /media/windows

but that yields the error

mount: wrong fs type, bad option, bad superblock on /dev/sda6,
       missing codepage or helper program or other error

...very helpful :-) Can anyone here tell me what that might be?