Linux kernel 3.3 had a stable NVMe driver version included, however, current Ubuntu versions released with the 3.19 Linux kernel may have a backported NVMe driver and may not require additional drivers to use the Intel® SSD 750 Series.
We advise you to review the information in page 13 of the Intel® Solid-State Drive DC S3700, P3600 and P3500 Series Installation Guide.
For driver details, you may also check the information found in the Intel® Solid-State Drive with Linux* NVMe* Driver Reference Guide for Developers.
Keep in mind that the NVM Express Linux driver development utilizes the typical open-source process used by kernel.org, so you may check their resources for assistance about this.
Additionally, you may find more information in official forums for Ubuntu.