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Need help with installing Ubuntu on Lenovo Ideapad Z500.

I just bought a new Lenovo Ideapad Z500 yesterday. It came with Windows 8 pre-installed. Now, I also want to install Ubuntu over it. The disk is partitioned as follows:
Disk C: - 880 GB (approx)
Disk D: - 30 GB (approx) (I don't remember exact partition, as my laptop is currently at my home).
Then I thought, I would better re-partition the C drive into 1 or 2 small drives. So, I shrinked the C drive by going into "Disk Management", and then created 3 more partitions - 240 GB * 2, 300 GB * 1, and left the C drive with 100 GB space. I didn't modified the D drive.
Till then I didn't went through any infomation over internet. But, now when I went through this forum, I found out that my OKR won't work now, that I still have to confirm when I go home. So, now I'm worried. I scanned through so many post here, and no where found a way to install Ubuntu on Ideapad Z500.
I also read that it will be possible to run OKR, if I can re-store the partition to it's original. I think this can be done, since I just have to remove the volume I created, and allocate the memory back to C drive. And it will be back to original state, as I didn't modify D drive (correct me if am wrong, or if it can't happen).
So, the major question that I want to ask is, is there no way to partition my disk, and install Ubuntu in one of them. 
The best answer: hi rohitjain-rj,
Welcome to the Lenovo Forums.
On a Z400 Touch running on Windows 8 preload, shrinking the the C-Drive under Disk Management and creating multiple partitions on the unallocated space and then reverting the partition back to original made the One Key Recovery work as normal - haven't tested this yet on the Z500 as there's no available unit but chances are, it may also work.
In installing Ubuntu, have you tried to install Ubuntu via Wubi ?
If Ubuntu doesn't start, boot into the BIOS (press the OKR button > select BIOS Setup Utility) and set the following:
Boot Tab
Boot Mode - Legacy Support
Boot Priority - Legacy First
Exit Tab
OS Optimized Defaults - Other OS
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