GRUB_DEFAULT=0 GRUB_TIMEOUT_STYLE=hidden GRUB_TIMEOUT=0 GRUB_RECORDFAIL_TIMEOUT=5 GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian` GRUB_CMDLINE_LINUX_DEFAULT="" GRUB_CMDLINE_LINUX="" GRUB_TERMINAL="console" GRUB_DISABLE_SUBMENU="y" GRUB_DISABLE_OS_PROBER="true" GRUB_DISABLE_RECOVERY="true"