sudo tee /mnt/oldgrub/grub/grub.cfg > /dev/null <<'EOF'
set timeout=5
set default=0
menuentry "Ubuntu 26.04 LTS" {
search --no-floppy --fs-uuid --set=root fccb6e14-8932-407f-8b10-10852391390c
linux /boot/vmlinuz root=UUID=fccb6e14-8932-407f-8b10-10852391390c rw quiet splash
initrd /boot/initrd.img
}
menuentry "Windows Boot Manager" {
search --no-floppy --fs-uuid --set=root BAF6-2FEA
chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}
EOF