Comment 46 for bug 1734147

I can confirm the same problem on Lenovo Yoga 2 11".
Model Name: 20332.

TL;DR:
Bios does not save any changes, i.e. Secure Boot cannot be switched back on
USB boot devices are not detected

I wanted to install Ubuntu along Windows 10 (dual boot). It was clean an simple install of Ubuntu 17.04. When I installed 17.04 version I found out that I need to disable Secure Boot in Bios in order for WiFi module to work with included proprietary drivers. Which I did and Wifi worked fine.Then I upgraded to 17.10, the upgrade process was simple and no errors shown.

After playing with 17.10 for a bit I wanted to boot back into Windows and was greeted by black screen and no disk activity after selecting Windows Boot Manager. I thought that the problem may be because Secure boot was still disabled in Bios. I went into Bios and tried to enable it. Obviously it had no effect since after several attempts I went into Bios and realised that any changes I make in Bios are not saved anymore like for almost everyone on this thread.

Then I tried to boot from Ubuntu Live 17.04, thinking that may be I would be able to debug better in the previous Ubuntu version. Then I realised that I can't boot with the very same bootable flash disk I used to install Ubuntu 17.04.

This leaves me with a (currently still) working version of Ubuntu 17.10, no ability to boot into Windows Safe/Recovery Mode and no option to boot from bootable USB disks.

When I install/upgrade an OS I am prepared to lose the data on the HDD, in the worst case scenario... But not to brick the motherboard/system!!! :-O What year is this? 1985?

Any help appreciated.