'prevent LinodeStackScript closing sub-processes after it's finished

In my StackScript (for Linode):

apt-get -qy install xserver-xorg-core openbox --no-install-recommends --no-install-suggests
apt-get -qy install xinit tint2
setsid startx &
...

When the script ends, it closes the X-screen.
How can I make the X-screen to remain?
(setsid doesn't help)

bash linode

Sources

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Solution	Source