Based on the description of how the problem arises - Ubuntu 17.10
installed on a system booted in legacy mode, not in UEFI mode, and the
problem showing up only after upgrade to Ubuntu 17.10 when Ubuntu 17.04
was running fine - it is likely that any problems here are in the Linux
kernel rather than in the bootloader. When booting in BIOS mode instead
of UEFI mode, the grub package does not do anything that touches
firmware settings; and there have been no relevant changes to the grub
code when booting in BIOS mode, between 17.04 and 17.10.
Therefore reassigning this bug to the kernel.
** Package changed: grub2 (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1734147
Title:
Ubuntu 17.10 corrupting BIOS - many LENOVO laptops models
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