Custom boot disk

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Custom boot disk

Jerry Geis
HI All,

I am trying to create a customer boot CD/DVD/iso.  Basically just copy the iso
and "replace" one file the boot menu txt.cfg is what I want to do. I added a timeout line "timeout 90" and a label entry. That is all. My Script:

DATE=`date "+%Y.%m.%d"`

rm /home/silentm/CDROM.iso/Ubuntu.20.04/*.LSI.*.iso

mount -o loop /home/silentm/CDROM.iso/Ubuntu.20.04/ubuntu-20.04.1-live-server-amd64.iso $MOUNT_POINT



# Put in CUSTOM file
cp /home/silentm/src/isolinux_ubuntu20.txt.cfg $DESTINATION_DIR/isolinux/txt.cfg

mkisofs -r -V "Custom Ubuntu Server Install CD" \
        -cache-inodes \
        -J -l -b isolinux/isolinux.bin \
        -c isolinux/ -no-emul-boot \
        -boot-load-size 4 -boot-info-table \


Runs without errors. But when I boot the iso - its like my changes did not take effect at all. I do not get a menu with a 9 second timeout and the boot just boots into the normal first menu screen with the Try or Install.

What am I missing to get a menu to show to select the install menu item I added.
Must be something easy.


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