Re: Installer can't recognize Win 8 file system - Dell XPS 15 (P31F) (2013 edition)
Boot with Ubuntu DVD/USB and 'Try Ubuntu (Without Installing)', Open Terminal [Ctrl+Alt+T], run the following commands and post its output here:
The problem you describe is common when 'no space' has been left for Ubuntu as either 'unallocated space' or a Linux partition. The output from the above will tell us how your HDD is partitioned and we can advice you further based on the output.
sudo parted -l
sudo fdisk -l
"Evolution is Nature's way of issuing upgrades."