Comment 28 for bug 665218

I just tried with a package that can't be installed on a regular Ubuntu system (ltsp-client-core). The installation process showed the debconf critical message from ltsp-client-core telling the user it can't be installed on an non-LTSP. The install then fails but APT is still in a consistent state (with ltsp-client-core getting removed) after that.

I'll try something else that fails even more than ltsp-client-core and try the suggested "start GUI from preinst/postinst" to see how aptdaemon deals with that.