search --set=root --file /ubuntu

insmod all_video

set default="0"
set timeout=30

menuentry "Try Ubuntu 1 FS without installing" {
   linux /casper/vmlinuz boot=casper ro enforcing=0 efi=noruntime pcie_ports=compat
   initrd /casper/initrd
}
menuentry "Install Ubuntu FS" {
   linux /casper/vmlinuz boot=casper only-ubiquity quiet splash
   initrd /casper/initrd
}

menuentry "Check disc for defects" {
   linux /casper/vmlinuz boot=casper integrity-check quiet splash ---
   initrd /casper/initrd
}