Hi. 
I'm surprised that this issue it has just found. I've met it already in May on 
my Lenovo E31-70 with Xubuntu 16.04.03. (initially laptop was bought with 
FreeDOS). I thought the problem was with BIOS which I reflashed about 1 year 
ago.
Local Lenovo support diverted me - said they can do nothing.

But - I need to recheck it today - after installing new kernel 4.14.08 - looks 
like the problem is solved. At least I could off Security boot and it survived 
reboot.
Also I've mentioned laptop tried to boot from external usb disk connected.

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

Title:
  Ubuntu 17.10 corrupting BIOS - many LENOVO laptops models

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