You cannot run a GUI package manager because Ubuntu Mini-Remix only has apt (command line).
You cannot run a terminal from uck-gui because the Mini-Remix does not have X11.
When customizing the Mini-Remix your only choices are
(a) run the command line interfaces of UCK, or
(b) try your luck with uck-flow from the unstable PPA.
You cannot run a GUI package manager because Ubuntu Mini-Remix only has apt (command line).
You cannot run a terminal from uck-gui because the Mini-Remix does not have X11.
When customizing the Mini-Remix your only choices are
(a) run the command line interfaces of UCK, or
(b) try your luck with uck-flow from the unstable PPA.