If you want to add autostart apps to your Fedora remix there is one quick and easy way to do it.
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Open your kickstart file and find section that starts with “%post”.
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Any command that you issue in %post section run with root privileges in build environment before iso image is created.
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Any application that you add to ~/.config/autostart folder start up in GNOME 3 when user logs on. To make this system wide you need to put your application shortcuts in /etc/skel/.config/autostart directory
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so here is one example how your kickstart could look like: