Brian, you won't find anything out about this on the Lenovo site, and they likely delete customer reviews that may allude to not being able to install Linux, or not being able to disable Secure Boot. Lenovo is not like the good old IBM computer group of years back. They're a Microsoft partner, and when asked to jump, they in turn ask 'how high?'
This is because when the times were tough, Microsoft took care of the larger OEM's, and even allowed these to produce a small percentage of non-Windows computers to generate income & to reduce layoffs during the Windows 8 years (2012-2015). There was a string attached though, when prosperity came around again, that they'd look after Microsoft. Now that the popular Windows 7 is 7 years old (nearly 8 counting the Betas), and many of these computers are now showing signs of age, OEM's are beginning to prosper again & repaying their debt to Microsoft.
That's why it's doesn't need to be posted in words on the Lenovo & other OEM sites, they're not the only ones in bed with Microsoft. While Dell carries notebooks loaded with Ubuntu 16.04 (& prior to that, 14.04), one has to look all the way in the dark corner of the Business section to find these. Not listed as consumer notebooks, way overpriced if these were, and per whatever agreement with Microsoft, keeps these off the front page.
Going back to IBM, now Lenovo, they used to be a large retailer of UNIX powered computers. Some hay have forgotten that, or wasn't yet born, yet it's true.