I recently installed a clean version of Windows 8.1 Professional on my Lenovo Y500 (with Samsung 256GB 840 Pro SSD).
I have Windows all set up and running normally.
I am trying to dual boot Windows 8.1 and Ubuntu 13.10, but the installation procedure don't allow me to either "Install alongside..." or shows my SSD partitions correctly when I chose the "Something Else" option.
I have created a 25GB partition of free space in the Windows disk manager, but on the installation screen on Ubuntu, it shows the whole drive as a free space.
I have tried installing with a burned .ISO disk and a bootable USB, the results are the same for both.
Windows Disk Management screen:
http://imageshack.us/a/img855/9504/59zu.jpg
The Ubuntu installation screen:
http://imageshack.us/a/img62/2712/9g6i.jpg
I've ran into this problem before when trying to dual boot Ubuntu and Windows 7 Professional a month ago. But I gave up and never resolved the issue.
--EDIT--
I tried what Eero Aaltonen suggested, and this is my result:
ubuntu@ubuntu:~$ sudo parted /dev/sda print
Warning: /dev/sda contains
GPT signatures, indicating that it has a GPT table. However, it does
not have a valid fake msdos partition table, as it should. Perhaps it
was corrupted -- possibly by a program that doesn't understand GPT
partition tables. Or perhaps you deleted the GPT table, and are now
using an msdos partition table. Is this a GPT partition table?
Yes/No? yes
Model: ATA Samsung SSD 840 (scsi) Disk /dev/sda: 256GB Sector size
(logical/physical): 512B/512B Partition Table: gpt
Number Start End Size File system Name Flags
ubuntu@ubuntu:~$
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