This file is indexed.

/etc/calamares/modules/bootloader.conf is in calamares-settings-lubuntu 1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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---
efiBootLoader: "grub"

# systemd-boot configuration files settings, set kernel and initramfs file names
# and amount of time before default selection boots
kernel: "/vmlinuz-linux"
img: "/initramfs-linux.img"
fallback: "/initramfs-linux-fallback.img"
timeout: "10"
# Optionally set the menu entry name and kernel name to use in systemd-boot.
# If not specified here, these settings will be taken from branding.desc.
# bootloaderEntryName: "Generic GNU/Linux"
# kernelLine: ", with Stable-Kernel"
# fallbackKernelLine:  ", with Stable-Kernel (fallback initramfs)"

# GRUB 2 binary names and boot directory
# Some distributions (e.g. Fedora) use grub2-* (resp. /boot/grub2/) names.
grubInstall: "grub-install"
grubMkconfig: "grub-mkconfig"
grubCfg: "/boot/grub/grub.cfg"

# Optionally set the bootloader ID to use for EFI. This is passed to
# grub-install --bootloader-id.
#
# If not set here, the value from bootloaderEntryName from branding.desc
# is used, with problematic characters (space and slash) replaced.
#
# The ID is also used as a directory name within the EFI environment,
# and the bootloader is copied from /boot/efi/EFI/<dirname>/ . When
# setting the option here, take care to use only valid directory
# names since no sanitizing is done.
#
efiBootloaderId: "lubuntu-next"