I encountered the package operation failed error while installing Draftsight on Ubuntu 11.10. Below are the screenshots.

The last line of the error detail shows:

(ShowLicence:17140): Gtk-WARNING **: cannot open display: :0.0

dpkg: error processing /home/dwight/Downloads/DraftSight.deb (--install):

subprocess new pre-installation script returned error exit status 1

What shall I do next? Can somebody help me on this?