@axt thank you for the update. But the problem is my BIOS has now become read 
only. Earlier last year, I tried to upgrade ubuntu from 17 to 19 and since then 
the BIOS has become read only. If I make any changes it will not get saved. 
That's my main issue.
I cannot boot from USB,
I cannot boot from DVD etc..

My default first boot device is Ubuntu and then windows and then USB and
network.. etc..

Even if I do f12 and select boot from USB it doesn't work.

@axt I even tried flashing the BIOS it does not boot from my Pen drive. I 
downloaded the latest version of UEFI as per BIOS Update for Windows 7 (32-bit, 
64-bit), Windows 8 (64-bit) , Windows 8.1 (64-bit), Windows10 (64-bit) - Lenovo 
Z40-70, Z50-70
 and tried to execute the package from windows 8 os but after reboot nothing 
happens. the Bios version is not changed and the bios is still not saving any 
changes what ever changes I do in it.

now I have removed the ubuntu and deleted few partitations of Linux
using partition magic.

but now the system partition where the UEFI files are there is still
there.

Last night I tried to run pratation magic. Assigned a drive letter to the 
system partation
then using powershell with admin rights I tried to replace the 
grubx64.efi.signed  in UEFI folder under Ubuntu but it didn't work 

Now I have removed the Ubuntu folder from that partition and now it
directly boots to windows as soon as I start my laptop but my main
concern is to fix the BIOS which is not saving my changes in it.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1734147

Title:
  corrupted BIOS due to Intel SPI bug in kernel

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  Fix Released
Status in linux-hwe-edge source package in Xenial:
  Fix Released
Status in linux-oem source package in Xenial:
  Fix Released
Status in linux source package in Artful:
  Fix Released

Bug description:
  An update to linux kernel on Ubuntu 17.10 that enabled the Intel SPI
  drivers results in a serial flash that is read only in Intel Broadwell
  and Haswell machines with serial flashes with SPI_NOR_HAS_LOCK set.

  Symptoms:
   * BIOS settings cannot be saved
   * USB Boot impossible
   * EFI entries read-only.

  ---

  Fix: The issue was fixed in kernel version 4.13.0-21 by configuring
  the kernel so it is not compiled with Intel SPI support. But previous
  affected machines still suffered from a broken BIOS.

  Repair: If you still can boot into Ubuntu, you can recover your BIOS
  with the following steps:

  1. Boot into Ubuntu
  2. Download 
http://people.canonical.com/~ypwong/lp1734147/linux-image-4.15.0-041500rc6-generic_4.15.0-041500rc6.201712312330+20170103+1_amd64.deb
  3. Install the downloaded package:
    $ sudo dpkg -i 
linux-image-4.15.0-041500rc6-generic_4.15.0-041500rc6.201712312330+20170103+1_amd64.deb
  4. Make sure the kernel is installed without any error. Once installed, 
reboot.
  5. At grub, choose the newly installed kernel. You can choose the "recovery" 
mode.
  6. Reboot and go to BIOS settings to confirm your BIOS has been recovered.
  7. In case your BIOS is not recovered, reboot to the new kernel, then reboot 
*once again* to the new kernel, do not enter BIOS settings before the reboot. 
After the second reboot, check BIOS.
  8. If your BIOS issue remains, download another kernel from 
http://people.canonical.com/~ypwong/lp1734147/linux-image-4.15.0-041500rc6-generic_4.15.0-041500rc6.201712312330+clear+debug_amd64.deb,
 and use dpkg to install it, then repeat steps 4 to 6.

  After your BIOS is fixed, the kernel packages you just installed are
  no longer needed, you can remove it by running 'sudo dpkg -r linux-
  image-4.15.0-041500rc6-generic'.

  The patch used to build the linux v4.15 kernel in step 8 can be found
  at https://goo.gl/xUKJFR.

  If you have applied updates, and find that you can not boot the above
  fixed kernel because of Secure Boot and that the kernel is unsigned,
  but can still boot another kernel for your system; here's what you can
  do:

  1) Download 
http://archive.ubuntu.com/ubuntu/dists/xenial/main/uefi/grub2-amd64/current/grubx64.efi.signed:
  $ wget 
http://archive.ubuntu.com/ubuntu/dists/xenial/main/uefi/grub2-amd64/current/grubx64.efi.signed

  2) Copy grubx64.efi.signed over /boot/efi/EFI/ubuntu/grubx64.efi:
  $ sudo cp grubx64.efi.signed /boot/efi/EFI/ubuntu/grubx64.efi

  3) Reboot; you should now be able to load the new unsigned kernel that
  allows fixing firmware / SPI.

  4) Once you're satisfied that things work; boot to Ubuntu with a
  standard, signed kernel, and re-install the right GRUB version for
  your system:

  $ sudo grub-install

  ---

  Test Case: Fix has been verified by our HWE team on affected hardware.

  Regression Potential: Minimal, it's unlikely anyone is actually doing
  anything which requires this driver.

  ---

  Affected Machines:

  Lenovo B40-70
  Lenovo B50-70
  Lenovo B50-80
  Lenovo Flex-3
  Lenovo Flex-10
  Lenovo G40-30
  Lenovo G50-30
  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 Yoga 3 11"
  Lenovo Z50-70
  Lenovo Z51-70
  Lenovo ideapad 100-15IBY

  Acer Aspire E5-771G
  Acer Aspire ES1-111M-C1LE (fixed following your new instruction (thank you))
  Acer TravelMate B113
  Acer Swift SF314-52 (Fixed by 4.14.9)
  Toshiba Satellite S55T-B5233
  Toshiba Satellite L50-B-1R7
  Toshiba Satellite S50-B-13G
  Toshiba Satellite L70-A-13M
  Dell Inspiron 15-3531
  Mediacom Smartbook 14 Ultra M-SB14UC (fixed with official fix)
  Acer Aspire E3-111-C0UM
  HP 14-r012la

  ---

  Affected serial flash devices by manufacturer part number, JEDEC ID 
(SPI_NOR_HAS_LOCK set in drivers/mtd/spi-nor/spi-nor.c)
  /* ESMT */
     f25l32pa, 0x8c2016
     f25l32qa, 0x8c4116
     f25l64qa, 0x8c4117
  /* GigaDevice */
     gd25q16, 0xc84015
     gd25q32, 0xc84016
     gd25lq32, 0xc86016
     gd25q64, 0xc84017
     gd25lq64c, 0xc86017
     gd25q128, 0xc84018
     gd25q256, 0xc84019
  /* Winbond */
     w25q16dw, 0xef6015
     w25q32dw, 0xef6016
     w25q64dw, 0xef6017
     w25q128fw, 0xef6018

  ---

  Original Description:

  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.

  Thank you!!

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