Grub shouldnt just disappear!
Does running "update-grub" break it? (that would get triggered from time to
time on system updates)
You dual boot with Windows? Is it possible that Windows is messing with the
UEFI Boot Manager? Or does it happen when you reboot from Ubuntu?
I notice this diffing your before and after logs:
- set root='hd1,gpt2'
+ set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
- search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt2
--hint-efi=hd1,gpt2 --hint-baremetal=ahci1,gpt2
5290bec0-f256-4adf-804a-c44597538b95
+ search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2
--hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2
5290bec0-f256-4adf-804a-c44597538b95
I don't know why those would change, perhaps grub got confused and used
sdb to configure instead of your ubuntu partition (sda)
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https://bugs.launchpad.net/bugs/1561842
Title:
Grub bootloader disappears after a seemingly random amount of
restarts/shutdowns.
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