apt-get WARNING!

Gtk-WARNING**:cannot open display:at/usr/share/perl5/Debconf/FrontEnd/Gnome.pm lin 47
debconf:unable to initialize frontend:Gnome debconf:(DISPLAY:problem?)
debconf:failing back to frontend:Dialog.

$ sudo dpkg-reconfigure debconf

选dialog，

原文转自：http://www.ltesting.net