The issue is causing the BIOS of several Lenovo laptops to no longer save new settings. Once you’ve installed Ubuntu 17.10 and you reboot the laptop, the system will start with the old BIOS settings. The cause appears to be related with the intel-spi-* drivers in the Linux kernel, which aren’t ready for use. Lenovo B40-70, Lenovo B50-70, Lenovo B50-80, Lenovo Flex-10, Lenovo G40-30, Lenovo G50-70, Lenovo G50-80, Lenovo S20-30, Lenovo U31-70, Lenovo Y50-70, Lenovo Y70-70, Lenovo Yoga Thinkpad (20C0), Lenovo Yoga 2 11″ – 20332, Lenovo Z50-70, Lenovo Z51-70, and Lenovo IdeaPad 100-15IBY are among the Lenovo laptops known to be affected by the issue.