Moved to your own thread as your issues are somewhat different.
If you go into UEFI menu can you not choose ubuntu? It looks like you originally installed Ubuntu in BIOS mode where Windows is in UEFI mode. Both have to be same mode to easily dual boot. And you have to set in UEFI/BIOS what system you want to boot.
It looks like Boot-Repair has a bug. It recently changed from automatically making backups of Windows files and using those to boot. The boot stanza in 25_custom is wrong and you need to fix it. Remove the bkp or the reference to the backup version which does not exist in your install currently.
Your Windows boot file:/EFI/Microsoft/Boot/bootmgfw.efi
Your menu entry:
Code:
menuentry "Windows UEFI bkpbootmgfw.efi" {
search --fs-uuid --no-floppy --set=root 8C82-899E
chainloader (${root})/EFI/Microsoft/Boot/bkpbootmgfw.efi
}
If from live installer you have to mount the partition with 25_custom. If from working install you do not. You can only run the sudo update grub command from inside your working install.
From live installer:
sudo mount /dev/sda5 /mnt
sudo cp -a /mnt/etc/grub.d/25_custom /mnt/etc/grub.d/bkup25_custom
gksudo gedit /mnt/etc/grub.d/25_custom
#Then do this only after booting into your working install:
sudo update-grub
From working install.
sudo cp -a /etc/grub.d/25_custom /etc/grub.d/bkup25_custom
gksudo gedit /etc/grub.d/25_custom
#Then do:
sudo update-grub
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