Lenovo z50-70 (20354) corrrupted bios, can modify only date and time.
Lastest version of bios allready installed.
I've only tried ubuntu 17.10. My luck is I've installed grub2, so from usb I 
can load conf and boot all my operative systems. No way to do something for 
rewrite from the laptop.
So, if you can boot the uefi live usb, another workaround is take the disk and 
install grub (if you haven't one installed yet), and when you boot the usb 
press 'c' key and load the config file for grub.

If anyone have a sane bios image, please dump it and public it, so I'll
try to reflash the image on my bios.

Regards,
Igor

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

Title:
  Ubuntu 17.10 corrupting BIOS - many LENOVO laptops models

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