For the sake of testing I've updated to the latest grub from 19.10
(2.04-1ubuntu12) and I can't boot Windows anymore. My exact steps were:
0. Ubuntu 19.10 with grub from 19.04. Everything works
1. Move /etc/grub.d/07_os-prober back to /etc/grub.d/30_os-prober to rule this
change out
2. sudo apt update && sudo apt dist-upgrade
3. sudo grub-install /dev/sda
4. sudo update-grub
5. Reboot
6. Can't boot Windows anymore
I've compared grub config from 2.02 to 2.04. They look almost exactly
the same. The only differences are:
- set vt_handoff=vt.handoff=1
+ set vt_handoff=vt.handoff=7
and
+### BEGIN /etc/grub.d/10_linux_zfs ###
+### END /etc/grub.d/10_linux_zfs ###
Windows part config:
menuentry 'Windows Boot Manager (on /dev/sda1)' --class windows --class os
$menuentry_id_option 'osprober-efi-CAC2-FF0C' {
insmod part_gpt
insmod fat
set root='hd0,gpt1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1
--hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1 CAC2-FF0C
else
search --no-floppy --fs-uuid --set=root CAC2-FF0C
fi
chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}
I've recorded video of boot process with "set debug=all" grub config.
Send me a message through https://launchpad.net/~xeron-
oskom/+contactuser if you want to see it.
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https://bugs.launchpad.net/bugs/1845289
Title:
Grub EFI amd64 no longer start EFI/Microsoft/Boot/bootmgfw.efi
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