This file is indexed.

/etc/ltsp/update-kernels.conf is in ltsp-client-core 5.5.7-1.

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

The actual contents of the file can be viewed below.

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# Default boot options
# Use a menu for booting
#PXELINUX_DEFAULT=menu

# Set default timeout to 10 seconds (hundreths of a second)
#TIMEOUT=100

# Set default boot item on timeout
#ONTIMEOUT=ltsp-NBD

# Use ifcpu64.c32 to detect 64-bit, PAE or 32-bit machines.
#PXELINUX_DEFAULT=ltsp-ifcpu64-NFS
#IFCPU64=true

# Supported booth methods
BOOT_METHODS="NBD NFS AOE"

# Default commandline arguments common to all boot methods
CMDLINE_LINUX_DEFAULT="init=/sbin/init-ltsp forcepae"

# Commandline used with NFS root
CMDLINE_NFS="root=/dev/nfs ip=dhcp boot=nfs"

# Commandline used with NBD root
CMDLINE_NBD="root=/dev/nbd0"

# Commandline used with AOE root
CMDLINE_AOE="root=/dev/etherd/e0.0"

# A sed expression that matches all kernels and returns $FILE $NAME $VERSION $FLAVOR
# Example: ls /boot | sed -n "$KERNEL_NAMES" | sort -k 4,4V -k 3,3rV
KERNEL_NAMES='s/\(vmlinu[xz]-\)\([^-]*-[^-]*-\)\(.*\)/& \1 \2 \3/p'

# A sed expression that maps from a kernel name to an initrd name
# Example: initrd=$(echo "$FILE" | sed -n "$INITRD_NAME")
INITRD_NAME='s/vmlinu[xz]/initrd.img/p'

# Kernel variants
KERNEL_PREFIX="vmlinu[z|x]-*"
KERNEL_SUFFIX=""

# Kernel variants that are supported by 64-bit CPUs
LIST_KERNELS_64=""
# Variants that are supported by PAE capable CPUs
LIST_KERNELS_PAE="lowlatency-pae virtual-pae generic-pae"
# Variants that are widely supported (i.e. 32-bit CPUs)
LIST_KERNELS_32="lowlatency virtual generic"
# Preferred default kernel order
#LIST_KERNELS_DEFAULT="generic-custom generic-pae-custom"

# Use pxelinux/syslinux's IPAPPEND parameter to add useful networking and
# other system information to the boot commandline:
# 1: Add networking: ip=<client-ip>:<boot-server-ip>:<gw-ip>:<netmask>
# 2: Add BOOTIF=<hardware-address-of-boot-interface>
# 3: both 1 & 2
# 4: Add SYSUUID=<system uuid>
#IPAPPEND=3