Recover data from lost partiton after install ubuntu - recovery

i have a 500GB HDD. when i install Ubuntu i was made a mistake that i install Ubuntu by replacing windows 7. after installation Ubuntu run fine. But my HDD have only one part ion of whole 500Gb. Now how can i get my previous data from this HDD?
thanks in advance.

Make a live bootable GNU/Linux system and run on your pc. Install "TestDisk" Package. Then Restore old partition table with test disk. For more info visit this link. here

I had the same problem when I installed Ubuntu on a 50 GB of unallocated space on a laptop already containing Windows 8.1. I lost all my partition and a single partition was created by Ubuntu.
Testdisk is a great tool to help you work with the lost data and partitions. Believe me testdisk is really a great tool to help you recover your data.
For a complete walkthrough on the process to recover your all partitions and the data you can visit this page TestDisk - Step by Step

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