This seems like the BIOS failing to write to disk when trying to write
the environment block and not an actual bug in GRUB2.
Perhaps trying UEFI mode might help on newer machines.
** Changed in: grub2 (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1553687
Title:
Lenovo Y700-17ISK Boot Error: Failure writing sector 0x21c8800 to
'hd0'
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