[Bug 1734147] Re: Ubuntu 17.10 corrupting BIOS - many LENOVO laptops models

[Marius]

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.

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https://bugs.launchpad.net/bugs/1734147

Title:
  Ubuntu 17.10 corrupting BIOS - many LENOVO laptops models

Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  Hi all,

  Basically on Lenovo Y50-70 after installing Ubuntu 17.10, many users
  reported a corrupted BIOS.

  It's not possible to save new settings in BIOS anymore and after
  rebooting, the system starts with the old settings.

  Moreover (and most important) USB booting is not possible anymore
  since USB is not recognized. It's very serious, since our machines do
  not have a CDROM.

  Lenovo forums at the moment are full of topics regading this issue.

  For example:

  https://forums.lenovo.com/t5/Lenovo-P-Y-and-Z-series/Y50-70-BIOS-Can-t
  -Save-Settings-or-boot-with-USB/m-p/3849142

  https://forums.lenovo.com/t5/Lenovo-P-Y-and-Z-series/Y50-70-BIOS-Can-t
  -Save-Settings-Or-Exit/m-p/3601285

  https://forums.lenovo.com/t5/Lenovo-P-Y-and-Z-series/y50-70-BIOS-can-t
  -save-settings-and-I-can-t-boot-system/m-p/3865727

  Thank you!!

  #### UPDATE (27/11/2017) ####

  LENOVO machines affected so far:

  Lenovo Y50-70
  Lenovo G40-30
  Lenovo U31-70
  Lenovo G50-70
  Lenovo Z50-70
  Lenovo Yoga Thinkpad (20C0)

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