Ubuntu 15.04 (Vivid) has now been released and it fixes mostly all of the issues I had with my Thinkpad T450. I recommend doing a clean install of Ubuntu 15.04 and mostly avoiding all of the steps bellow!
My process for getting Ubuntu running really nicely on a Thinkpad T450 with all the hardware working. (I have my track pad disabled in the bios and only want to use the track point.)
Basic steps to get Ubuntu running nicely on the Thinkpad T450:
- Install Ubuntu 14.10
- Install latest stable mainline kernel (3.19.3 vivid at time of writing)
- Install headers_all package
- then headers_amd64 package