I had two partitions in NTFS and one in ext4 (Ubuntu 12.04 installed one week ago), something gone wrong and the OS couln'd start. I tried to reinstall a new version and by mistake choosed the option to install the system on the previous, he erased all the data I had (NTFS and ext4), I wanted to format only the ext4 partition. On the NTFS partitions I had very important data. How can I recover it? What applications should I use?
Thank you in advance.