Where is "txt.cfg"?

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http://askubuntu.com – I'm using Lubuntu 12.10 on a USB stick but it is not persistent. Instructions on how to make it persistent are in this thread: Why isn't persistence working on Lubuntu 12.04 Live-USB? But I can find neither a directory syslinux nor a file called txt.cfg or syslinux.cfg (I have, for example, used the command find / txt.cfg at the $ prompt) Where is the configuration file for Lubuntu 12.10? :-) (HowTos)