One of the best-supported Linux systems out there. Read the About page and you will be amazed as you might think it's just another Ubuntu clone, but it's not. The author has done a tremendous job of customizing it and fixing many of the problems found in Ubuntu, that Canoncial has not yet come around to fix. The 16.04 LTS 64bit installed without a hitch on Lenovo Thinkpad X300 and everything worked out of the box. You can also run it on your Lenovo Thinkpad R500 without a problem - the author helps (through his FB messenger, where he offers support) set it up.