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I've a problem, related to this bug.

I've booted Ubuntu 17.10 from a USB stick on mine Lenovo G-50 (I don't remember now if in Live or persistence mode), after that moment I coulnd't change BIOS settings anymore, now every time I power on my laptop a message appears saying:

EFI USB boot failed

And I need to press Enter to enter in Windows 8.1 (which is on my hard drive) , if I change the settings in the BIOS they won't be saved, does the workaround of changing kernel of Ubuntu works for me too?

What should I do? Create a USB boot device with Ubuntu 17.10 and follow the instructions to change the kernel?

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The bug is fixed in the 'artful dot one' release 17.10.1, that you find at http://releases.ubuntu.com/17.10.1/

Ubuntu 17.10.1 ISOs Now Available To Avoid Thrashing Some UEFI Systems

It was a BIOS/UEFI corrupting problem but fortunately for affected users a software fix was discovered to make the hardware happy again.

It's important to note that this 17.10.1 ISO re-release does not have any KPTI/Retpoline for Meltdown/Spectre mitigation or other changes. So it's still important to update your system once installed.

  • So should i create another usb boot device with that version, boot from it in live mode and i can change the bios settings again? Sorry, noob here – Stefano Mar 11 '18 at 9:17
  • Yes, that is a good idea. – sudodus Mar 11 '18 at 9:18
  • Thanks for your suggestions, however I didn't succed to boot from usb where was installed with Rufus the Ubuntu 17.10.1 version's using filesystem fat32 and GPT partition for UEFI as settings. Mine pendrive just won't show up in the boot options. I'll probably look for an update of the bios. – Stefano Mar 12 '18 at 19:24
  • @Stefano, 1. Please check the md5sum, that the iso file is good; 2. Try to clone from the iso file to the USB pendrive with Win32 Disk Imager in Windows or the Startup Disk Creator, Disks or mkusb in Ubuntu. A cloned Ubuntu 64-bit system in a pendrive can boot both in UEFI mode and BIOS (CSM, legacy) mode. -- But the computer must be able to boot from USB, maybe you are right: that is the problem. – sudodus Mar 12 '18 at 19:31
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    On my Lenovo Fn-F2 gets you to BIOS, and (probably what you need) Fn-F12 adds usb as a boot option. Hope it helps. BTW I also have a corrupted BIOS. – Kotie Smit Mar 14 '18 at 20:27

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