Most likely what is happening is that the EFI boot variables are somehow
getting messed up, and your bios is buggy and goes off the deep end when
this happens. After installing grub-pc, check dmesg for any EFI related
errors, and run sudo efibootmgr and post the output please.
** Changed in: grub2 (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1082418
Title:
Ubuntu UEFI install locks out UEFI firmware (~bios) access
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