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. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1734147 Title: Ubuntu 17.10 corrupting BIOS - many LENOVO laptops models To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1734147/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs