It doesn't require X. It only tries to make use of it, if its available.
Since the patch only unsets your DISPLAY variable and update-app-install
works in my local console, I assume, that you have a DISPLAY variable
that points to a non working/accessible x server. That is why the
programm failed. What in the end is a bug.

Right, I am also not happy with the warning. I will take a look if we
can separate the pygtk stuff from the caching. But since the bug/warning
only appears in a non grafical environment, I think that the chance to
confuse a non techie user is quite small :)

Current alternatives are to create the cache at build time and increase
the package size by 3,5 Mbyte or to call it on the first run of gnome-
app-install and increase its startup time by some seconds. The second
one is not acceptable since the cache was introduced to decrease the
startup time :)

-- 
g-a-i postinst fails if X is not running
https://launchpad.net/bugs/59403

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