This solution worked for my Lenovo Y50-70
https://askubuntu.com/questions/984043/unable-to-make-changes-in-bios-after-17-10-installation/989771#989771
PS follow step 3 to the letter
This solution worked for my Lenovo Y50-70
https:/ /askubuntu. com/questions/ 984043/ unable- to-make- changes- in-bios- after-17- 10-installation /989771# 989771
PS follow step 3 to the letter