I am happy to publish this important article explaining how to fix the read-only BIOS/UEFI on Lenovo (and other) laptops caused by Linux distributions, using Ubuntu UKUU tool to install the mainline kernel 4.14.10 and unbrick the firmware, the sequence of necessary steps including GRUB bootloader update/install, several other pointers, and more. Take a look. https://www.dedoimedo.com/computers/lenovo-g50-read-only-nvram-solution.html Cheers, Mrk